diff --git a/FourOperations/.vs/FourOperations/v16/.suo b/FourOperations/.vs/FourOperations/v16/.suo
index c97dbe4bc844dbe072e913268f070148fcddbca2..3aabd9cbaf8a6ba4dc84c68ecebbf2cb6d8ff644 100644
Binary files a/FourOperations/.vs/FourOperations/v16/.suo and b/FourOperations/.vs/FourOperations/v16/.suo differ
diff --git a/FourOperations/FourOperations/BaseData/BasicData.cs b/FourOperations/FourOperations/BaseData/BasicData.cs
index 3c7578f2d0919a67eb0ab17b6dd1a446a8e43dd3..96ba46e3c47110bce4fb58d560ec7fdcfdad23d2 100644
--- a/FourOperations/FourOperations/BaseData/BasicData.cs
+++ b/FourOperations/FourOperations/BaseData/BasicData.cs
@@ -11,6 +11,8 @@
         public readonly string[] ArrayTheme = new string[10];//题目集合
         public readonly string[] ArrayAnswer = new string[10];//答案集合
 
+        public abstract void RandomNumber();
+
         public abstract void AddThemeCount();
 
         public abstract void SubThemeCount();
diff --git a/FourOperations/FourOperations/ClassTheme/FourTheme.cs b/FourOperations/FourOperations/ClassTheme/FourTheme.cs
index 2f78e4509c7a94bf737951682ca1f794fcce0683..993aeab3b99fbbea0b15a0c748ec8baf36987412 100644
--- a/FourOperations/FourOperations/ClassTheme/FourTheme.cs
+++ b/FourOperations/FourOperations/ClassTheme/FourTheme.cs
@@ -186,5 +186,10 @@ namespace ConsoleApp2.Themeup
         {
             throw new NotImplementedException();
         }
+
+        public override void RandomNumber()
+        {
+            throw new NotImplementedException();
+        }
     }
 }
diff --git a/FourOperations/FourOperations/ClassTheme/OneTheme.cs b/FourOperations/FourOperations/ClassTheme/OneTheme.cs
index 6698aa3ea71c563f6919acf0761dd84a6b9bebfa..90962e2864e980718c6adb993a7634e93659bf36 100644
--- a/FourOperations/FourOperations/ClassTheme/OneTheme.cs
+++ b/FourOperations/FourOperations/ClassTheme/OneTheme.cs
@@ -1,10 +1,12 @@
 using System;
 using System.IO;
+using System.Xml;
 
 namespace ConsoleApp2.Base
 {
     public class OneTheme : BasicData
     {
+        public int Num { get; set; }
         private readonly Random random = new Random();
         /// <summary>
         /// 一年级出题范围：20以内加减
@@ -16,7 +18,7 @@ namespace ConsoleApp2.Base
         /// <summary>
         /// 随机生成两位数0-20的范围
         /// </summary>
-        public void Randomnum()
+        public override void RandomNumber()
         {
             BasicDataA = random.Next(0, 20);
             BasicDataB = random.Next(0, 20);
@@ -29,7 +31,7 @@ namespace ConsoleApp2.Base
         {
             try
             {
-                Randomnum();
+                RandomNumber();
                 if (BasicDataA > 20 && BasicDataB > 20)
                 {
                     throw new Exception("A>20 并且 B>20");
@@ -51,7 +53,7 @@ namespace ConsoleApp2.Base
         /// <returns></returns>
         public override void SubTheme()
         {
-            Randomnum();
+            RandomNumber();
             try
             {
                 if (BasicDataA > 20 && BasicDataB > 20)
@@ -72,7 +74,7 @@ namespace ConsoleApp2.Base
                         BasicDataA -= BasicDataB;
                         Theme = BasicDataA + "-" + BasicDataB;
                         Answer = BasicDataA - BasicDataB;
-                    }           
+                    }
                 }
             }
             catch (Exception ex)
@@ -112,7 +114,7 @@ namespace ConsoleApp2.Base
         }
 
         /// <summary>
-        /// 用来装10道题目
+        /// 用来装10道题目Data
         /// </summary>
         /// <param name="Array1"></param>
         /// <param name="Array2"></param>
@@ -127,7 +129,7 @@ namespace ConsoleApp2.Base
         }
 
         /// <summary>
-        /// 输出10道题目和答案
+        /// 输出10道题目和答案Date
         /// </summary>
         /// <param name="Array1"></param>
         /// <param name="Array2"></param>
@@ -146,27 +148,24 @@ namespace ConsoleApp2.Base
 
 
         /// <summary>
-        /// 输出10题目 加法文件
+        /// 打印生成的10道题目Add
         /// </summary>
         public void AddOutPutTxt()
         {
             string result = @"D:\打印文件Add.txt";//保存文件路径
             OneTheme oneTheme = new OneTheme();
-            oneTheme.AddThemeCount();
             OutPutTxt(result, oneTheme);
+            AddOutPutXml(oneTheme);
         }
-
-
-
         /// <summary>
-        /// 输出减法文件
+        /// 打印生成的10道题目Sub
         /// </summary>
         public void SubOutPutTxt()
         {
             string result = @"D:\打印文件Sub.txt";//保存文件路径
             OneTheme oneTheme = new OneTheme();
-            oneTheme.SubThemeCount();
             OutPutTxt(result, oneTheme);
+            SubOutPutXml(oneTheme);
         }
 
         /// <summary>
@@ -178,12 +177,95 @@ namespace ConsoleApp2.Base
         {
             FileStream fs = new FileStream(result, FileMode.OpenOrCreate);
             StreamWriter wr = new StreamWriter(fs);
-            for (int i = 0; i < ArrayTheme.Length; i++)
+            for (int i = 0; i < oneTheme.ArrayTheme.Length; i++)
             {
-                wr.WriteLine(oneTheme.ArrayTheme[i] + FFF + oneTheme.ArrayAnswer[i]);
+                wr.WriteLine(ArrayTheme[i] + FFF + ArrayAnswer[i]);
             }
             wr.Flush();
             fs.Close();
         }
+
+
+        /// <summary>
+        /// 读取打印成txt的加法文件
+        /// </summary>
+        public void AddReaderTxt()
+        {
+            try
+            {
+                using (StreamReader sr = new StreamReader(@"D:\打印文件Add.txt"))
+                {
+                    string line;
+                    while ((line = sr.ReadLine()) != null)
+                    {
+                        Console.WriteLine(line);
+                    }
+                }
+            }
+            catch
+            {
+                throw new Exception("没有这个文件");
+            }
+        }
+        /// <summary>
+        /// 读取打印成txt的减法文件
+        /// </summary>
+        public void SubReaderTxt()
+        {
+            try
+            {
+                using (StreamReader sr = new StreamReader(@"D:\打印文件Sub.txt"))
+                {
+                    string line;
+                    while ((line = sr.ReadLine()) != null)
+                    {
+                        Console.WriteLine(line);
+                    }
+                }
+            }
+            catch
+            {
+                throw new Exception("没有这个文件");
+            }
+        }
+        /// <summary>
+        /// 同步Add打印xml
+        /// </summary>
+        /// <param name="oneTheme"></param>
+        public void AddOutPutXml(OneTheme oneTheme)
+        {
+            string fileName = "打印文件Add.xml";
+            OutPutXml(oneTheme, fileName);
+        }
+        /// <summary>
+        /// 同步Sub打印xml
+        /// </summary>
+        /// <param name="oneTheme"></param>
+        public void SubOutPutXml(OneTheme oneTheme)
+        {
+            string fileName = "打印文件Sub.xml";
+            OutPutXml(oneTheme, fileName);
+        }
+        /// <summary>
+        /// 打印Xml的数据
+        /// </summary>
+        /// <param name="oneTheme"></param>
+        /// <param name="fileName"></param>
+        private void OutPutXml(OneTheme oneTheme, string fileName)
+        {
+            XmlWriterSettings settings = new XmlWriterSettings();
+            settings.Indent = true;
+            using (XmlWriter writer = XmlWriter.Create("..\\..\\..\\" + fileName, settings))
+            {
+                writer.WriteStartElement("生成题目");
+                for (int i = 0; i < oneTheme.ArrayTheme.Length; i++)
+                {
+                    writer.WriteElementString("题目", ArrayTheme[i]);
+                    writer.WriteElementString("答案", ArrayAnswer[i]);
+                }
+                writer.WriteEndElement();
+            }
+            Console.WriteLine("xml同步写入成功");
+        }
     }
 }
diff --git a/FourOperations/FourOperations/bin/Debug/netstandard2.0/FourOperations.dll b/FourOperations/FourOperations/bin/Debug/netstandard2.0/FourOperations.dll
index 537dd451437f4c7cd4ffdd63586cbaed924ea710..2e85d3350791be17f881e6ceba2d06fda5fc49d9 100644
Binary files a/FourOperations/FourOperations/bin/Debug/netstandard2.0/FourOperations.dll and b/FourOperations/FourOperations/bin/Debug/netstandard2.0/FourOperations.dll differ
diff --git a/FourOperations/FourOperations/bin/Debug/netstandard2.0/FourOperations.pdb b/FourOperations/FourOperations/bin/Debug/netstandard2.0/FourOperations.pdb
index 4f4abb982b3874890f2fd73f3c2a2508c9f40dad..63367a30929783ec9924c55cf0153135ca850952 100644
Binary files a/FourOperations/FourOperations/bin/Debug/netstandard2.0/FourOperations.pdb and b/FourOperations/FourOperations/bin/Debug/netstandard2.0/FourOperations.pdb differ
diff --git a/FourOperations/FourOperations/obj/Debug/netstandard2.0/FourOperations.assets.cache b/FourOperations/FourOperations/obj/Debug/netstandard2.0/FourOperations.assets.cache
index 1500dc856b370f95def2f1324058ad7fb35c2e16..c6113bdfee245ac472dbc0b8dcfef96bddb8405c 100644
Binary files a/FourOperations/FourOperations/obj/Debug/netstandard2.0/FourOperations.assets.cache and b/FourOperations/FourOperations/obj/Debug/netstandard2.0/FourOperations.assets.cache differ
diff --git a/FourOperations/FourOperations/obj/Debug/netstandard2.0/FourOperations.csproj.CoreCompileInputs.cache b/FourOperations/FourOperations/obj/Debug/netstandard2.0/FourOperations.csproj.CoreCompileInputs.cache
index 606fca0c694ce00a91b46aa4f6d289cd163d2870..4335c7680aa8d5a8e1bfb745726cb779a3d8170b 100644
--- a/FourOperations/FourOperations/obj/Debug/netstandard2.0/FourOperations.csproj.CoreCompileInputs.cache
+++ b/FourOperations/FourOperations/obj/Debug/netstandard2.0/FourOperations.csproj.CoreCompileInputs.cache
@@ -1 +1 @@
-ed214248b9a021af9fccfeb7fd5555d2f19d5c57
+34b88cce88a29566bdd9f19c7b19b4410ca0a174
diff --git a/FourOperations/FourOperations/obj/Debug/netstandard2.0/FourOperations.csprojAssemblyReference.cache b/FourOperations/FourOperations/obj/Debug/netstandard2.0/FourOperations.csprojAssemblyReference.cache
index 300b03b3c0fb3874e717d29bd1fb1eb77483c7da..3dc2793891e88507ffe5fdf91a87660e312fe50e 100644
Binary files a/FourOperations/FourOperations/obj/Debug/netstandard2.0/FourOperations.csprojAssemblyReference.cache and b/FourOperations/FourOperations/obj/Debug/netstandard2.0/FourOperations.csprojAssemblyReference.cache differ
diff --git a/FourOperations/FourOperations/obj/Debug/netstandard2.0/FourOperations.dll b/FourOperations/FourOperations/obj/Debug/netstandard2.0/FourOperations.dll
index 537dd451437f4c7cd4ffdd63586cbaed924ea710..2e85d3350791be17f881e6ceba2d06fda5fc49d9 100644
Binary files a/FourOperations/FourOperations/obj/Debug/netstandard2.0/FourOperations.dll and b/FourOperations/FourOperations/obj/Debug/netstandard2.0/FourOperations.dll differ
diff --git a/FourOperations/FourOperations/obj/Debug/netstandard2.0/FourOperations.pdb b/FourOperations/FourOperations/obj/Debug/netstandard2.0/FourOperations.pdb
index 4f4abb982b3874890f2fd73f3c2a2508c9f40dad..63367a30929783ec9924c55cf0153135ca850952 100644
Binary files a/FourOperations/FourOperations/obj/Debug/netstandard2.0/FourOperations.pdb and b/FourOperations/FourOperations/obj/Debug/netstandard2.0/FourOperations.pdb differ
diff --git a/FourOperations/FourOperations/obj/FourOperations.csproj.nuget.dgspec.json b/FourOperations/FourOperations/obj/FourOperations.csproj.nuget.dgspec.json
index 68ed23e244eb0d876835b3bad35b101d8158b85a..33d3be2a25e6694684b93985782fec26b561b98e 100644
--- a/FourOperations/FourOperations/obj/FourOperations.csproj.nuget.dgspec.json
+++ b/FourOperations/FourOperations/obj/FourOperations.csproj.nuget.dgspec.json
@@ -1,24 +1,23 @@
 {
   "format": 1,
   "restore": {
-    "C:\\Users\\linso\\Desktop\\新建文件夹 (2)\\FourOperations\\FourOperations\\FourOperations\\FourOperations.csproj": {}
+    "C:\\Users\\Administrator\\Desktop\\xin仓库\\FourOperations\\FourOperations\\FourOperations.csproj": {}
   },
   "projects": {
-    "C:\\Users\\linso\\Desktop\\新建文件夹 (2)\\FourOperations\\FourOperations\\FourOperations\\FourOperations.csproj": {
+    "C:\\Users\\Administrator\\Desktop\\xin仓库\\FourOperations\\FourOperations\\FourOperations.csproj": {
       "version": "1.0.0",
       "restore": {
-        "projectUniqueName": "C:\\Users\\linso\\Desktop\\新建文件夹 (2)\\FourOperations\\FourOperations\\FourOperations\\FourOperations.csproj",
+        "projectUniqueName": "C:\\Users\\Administrator\\Desktop\\xin仓库\\FourOperations\\FourOperations\\FourOperations.csproj",
         "projectName": "FourOperations",
-        "projectPath": "C:\\Users\\linso\\Desktop\\新建文件夹 (2)\\FourOperations\\FourOperations\\FourOperations\\FourOperations.csproj",
-        "packagesPath": "C:\\Users\\linso\\.nuget\\packages\\",
-        "outputPath": "C:\\Users\\linso\\Desktop\\新建文件夹 (2)\\FourOperations\\FourOperations\\FourOperations\\obj\\",
+        "projectPath": "C:\\Users\\Administrator\\Desktop\\xin仓库\\FourOperations\\FourOperations\\FourOperations.csproj",
+        "packagesPath": "C:\\Users\\Administrator\\.nuget\\packages\\",
+        "outputPath": "C:\\Users\\Administrator\\Desktop\\xin仓库\\FourOperations\\FourOperations\\obj\\",
         "projectStyle": "PackageReference",
         "fallbackFolders": [
-          "C:\\Microsoft\\Xamarin\\NuGet\\",
-          "C:\\Program Files\\dotnet\\sdk\\NuGetFallbackFolder"
+          "C:\\Microsoft\\Xamarin\\NuGet\\"
         ],
         "configFilePaths": [
-          "C:\\Users\\linso\\AppData\\Roaming\\NuGet\\NuGet.Config",
+          "C:\\Users\\Administrator\\AppData\\Roaming\\NuGet\\NuGet.Config",
           "C:\\Program Files (x86)\\NuGet\\Config\\Microsoft.VisualStudio.Offline.config",
           "C:\\Program Files (x86)\\NuGet\\Config\\Xamarin.Offline.config"
         ],
diff --git a/FourOperations/FourOperations/obj/FourOperations.csproj.nuget.g.props b/FourOperations/FourOperations/obj/FourOperations.csproj.nuget.g.props
index a6c665ef69fd4e1484541861fdddecf05fba6c86..8653c9659ec4e810564ca072fb9c05fa8261cd48 100644
--- a/FourOperations/FourOperations/obj/FourOperations.csproj.nuget.g.props
+++ b/FourOperations/FourOperations/obj/FourOperations.csproj.nuget.g.props
@@ -5,7 +5,7 @@
     <RestoreTool Condition=" '$(RestoreTool)' == '' ">NuGet</RestoreTool>
     <ProjectAssetsFile Condition=" '$(ProjectAssetsFile)' == '' ">$(MSBuildThisFileDirectory)project.assets.json</ProjectAssetsFile>
     <NuGetPackageRoot Condition=" '$(NuGetPackageRoot)' == '' ">$(UserProfile)\.nuget\packages\</NuGetPackageRoot>
-    <NuGetPackageFolders Condition=" '$(NuGetPackageFolders)' == '' ">C:\Users\linso\.nuget\packages\;C:\Microsoft\Xamarin\NuGet\;C:\Program Files\dotnet\sdk\NuGetFallbackFolder</NuGetPackageFolders>
+    <NuGetPackageFolders Condition=" '$(NuGetPackageFolders)' == '' ">C:\Users\Administrator\.nuget\packages\;C:\Microsoft\Xamarin\NuGet\</NuGetPackageFolders>
     <NuGetProjectStyle Condition=" '$(NuGetProjectStyle)' == '' ">PackageReference</NuGetProjectStyle>
     <NuGetToolVersion Condition=" '$(NuGetToolVersion)' == '' ">5.5.0</NuGetToolVersion>
   </PropertyGroup>
diff --git a/FourOperations/FourOperations/obj/FourOperations.csproj.nuget.g.targets b/FourOperations/FourOperations/obj/FourOperations.csproj.nuget.g.targets
index f09823b850f2b3bc63252eb0a911579f970b65f4..8f2d2d658defc36b6b8b658296715f4f312f528e 100644
--- a/FourOperations/FourOperations/obj/FourOperations.csproj.nuget.g.targets
+++ b/FourOperations/FourOperations/obj/FourOperations.csproj.nuget.g.targets
@@ -4,6 +4,6 @@
     <MSBuildAllProjects>$(MSBuildAllProjects);$(MSBuildThisFileFullPath)</MSBuildAllProjects>
   </PropertyGroup>
   <ImportGroup Condition=" '$(ExcludeRestorePackageImports)' != 'true' ">
-    <Import Project="C:\Program Files\dotnet\sdk\NuGetFallbackFolder\netstandard.library\2.0.3\build\netstandard2.0\NETStandard.Library.targets" Condition="Exists('C:\Program Files\dotnet\sdk\NuGetFallbackFolder\netstandard.library\2.0.3\build\netstandard2.0\NETStandard.Library.targets')" />
+    <Import Project="$(NuGetPackageRoot)netstandard.library\2.0.3\build\netstandard2.0\NETStandard.Library.targets" Condition="Exists('$(NuGetPackageRoot)netstandard.library\2.0.3\build\netstandard2.0\NETStandard.Library.targets')" />
   </ImportGroup>
 </Project>
\ No newline at end of file
diff --git a/FourOperations/FourOperations/obj/project.assets.json b/FourOperations/FourOperations/obj/project.assets.json
index c364c365ad918593c56ecdceef5ec19b755e8039..7db8adc2280dacc515b41b9d43892d0189dc7f1d 100644
--- a/FourOperations/FourOperations/obj/project.assets.json
+++ b/FourOperations/FourOperations/obj/project.assets.json
@@ -180,25 +180,23 @@
     ]
   },
   "packageFolders": {
-    "C:\\Users\\linso\\.nuget\\packages\\": {},
-    "C:\\Microsoft\\Xamarin\\NuGet\\": {},
-    "C:\\Program Files\\dotnet\\sdk\\NuGetFallbackFolder": {}
+    "C:\\Users\\Administrator\\.nuget\\packages\\": {},
+    "C:\\Microsoft\\Xamarin\\NuGet\\": {}
   },
   "project": {
     "version": "1.0.0",
     "restore": {
-      "projectUniqueName": "C:\\Users\\linso\\Desktop\\新建文件夹 (2)\\FourOperations\\FourOperations\\FourOperations\\FourOperations.csproj",
+      "projectUniqueName": "C:\\Users\\Administrator\\Desktop\\xin仓库\\FourOperations\\FourOperations\\FourOperations.csproj",
       "projectName": "FourOperations",
-      "projectPath": "C:\\Users\\linso\\Desktop\\新建文件夹 (2)\\FourOperations\\FourOperations\\FourOperations\\FourOperations.csproj",
-      "packagesPath": "C:\\Users\\linso\\.nuget\\packages\\",
-      "outputPath": "C:\\Users\\linso\\Desktop\\新建文件夹 (2)\\FourOperations\\FourOperations\\FourOperations\\obj\\",
+      "projectPath": "C:\\Users\\Administrator\\Desktop\\xin仓库\\FourOperations\\FourOperations\\FourOperations.csproj",
+      "packagesPath": "C:\\Users\\Administrator\\.nuget\\packages\\",
+      "outputPath": "C:\\Users\\Administrator\\Desktop\\xin仓库\\FourOperations\\FourOperations\\obj\\",
       "projectStyle": "PackageReference",
       "fallbackFolders": [
-        "C:\\Microsoft\\Xamarin\\NuGet\\",
-        "C:\\Program Files\\dotnet\\sdk\\NuGetFallbackFolder"
+        "C:\\Microsoft\\Xamarin\\NuGet\\"
       ],
       "configFilePaths": [
-        "C:\\Users\\linso\\AppData\\Roaming\\NuGet\\NuGet.Config",
+        "C:\\Users\\Administrator\\AppData\\Roaming\\NuGet\\NuGet.Config",
         "C:\\Program Files (x86)\\NuGet\\Config\\Microsoft.VisualStudio.Offline.config",
         "C:\\Program Files (x86)\\NuGet\\Config\\Xamarin.Offline.config"
       ],
diff --git a/FourOperations/FourOperations/obj/project.nuget.cache b/FourOperations/FourOperations/obj/project.nuget.cache
index eca90ef351d34ad5bfbccc3ed86f4e449d41ed39..9c458d72c7c4da11d1834a1466f42f72f3fb28a8 100644
--- a/FourOperations/FourOperations/obj/project.nuget.cache
+++ b/FourOperations/FourOperations/obj/project.nuget.cache
@@ -1,11 +1,11 @@
 {
   "version": 2,
-  "dgSpecHash": "cKtolG8vsdAwbMXD/U7IHavPWfILbEjFFw1KR9VnKMUhe5OIYV/v0cTrrQORCLsP5uKaLl9EjCowrrndxYqDbg==",
+  "dgSpecHash": "rtS/oR//KVG1TIFL3NoAKB6k+sAF3jXjzkicjK8QnCzdTf3RgayRkn+L0xhCUi0qJaYRiuFeZgCH+fRWeJGUgQ==",
   "success": true,
-  "projectFilePath": "C:\\Users\\linso\\Desktop\\新建文件夹 (2)\\FourOperations\\FourOperations\\FourOperations\\FourOperations.csproj",
+  "projectFilePath": "C:\\Users\\Administrator\\Desktop\\xin仓库\\FourOperations\\FourOperations\\FourOperations.csproj",
   "expectedPackageFiles": [
-    "C:\\Program Files\\dotnet\\sdk\\NuGetFallbackFolder\\microsoft.netcore.platforms\\1.1.0\\microsoft.netcore.platforms.1.1.0.nupkg.sha512",
-    "C:\\Program Files\\dotnet\\sdk\\NuGetFallbackFolder\\netstandard.library\\2.0.3\\netstandard.library.2.0.3.nupkg.sha512"
+    "C:\\Users\\Administrator\\.nuget\\packages\\microsoft.netcore.platforms\\1.1.0\\microsoft.netcore.platforms.1.1.0.nupkg.sha512",
+    "C:\\Users\\Administrator\\.nuget\\packages\\netstandard.library\\2.0.3\\netstandard.library.2.0.3.nupkg.sha512"
   ],
   "logs": []
 }
\ No newline at end of file
diff --git a/FourOperations/FourOperationsDemo/Program.cs b/FourOperations/FourOperationsDemo/Program.cs
index a7fc45af337ddf93c3b3dc6c3f2d50d88b9129e4..7f9ae685bccfe3c2753cf45f502f92ce6e4274f0 100644
--- a/FourOperations/FourOperationsDemo/Program.cs
+++ b/FourOperations/FourOperationsDemo/Program.cs
@@ -65,7 +65,9 @@ namespace FourOperations
             //oneTheme1.AddThemeCount();
             //Console.WriteLine("---------------------------------------");
             //oneTheme1.SubThemeCount();
-            onetheme.SubOutPutTxt();
+            onetheme.AddThemeCount();
+            onetheme.AddOutPutTxt();
+            onetheme.AddOutPutXml(onetheme);
 
         }
     }
diff --git a/FourOperations/FourOperationsDemo/bin/Debug/netcoreapp3.1/FourOperations.dll b/FourOperations/FourOperationsDemo/bin/Debug/netcoreapp3.1/FourOperations.dll
index 537dd451437f4c7cd4ffdd63586cbaed924ea710..2e85d3350791be17f881e6ceba2d06fda5fc49d9 100644
Binary files a/FourOperations/FourOperationsDemo/bin/Debug/netcoreapp3.1/FourOperations.dll and b/FourOperations/FourOperationsDemo/bin/Debug/netcoreapp3.1/FourOperations.dll differ
diff --git a/FourOperations/FourOperationsDemo/bin/Debug/netcoreapp3.1/FourOperations.pdb b/FourOperations/FourOperationsDemo/bin/Debug/netcoreapp3.1/FourOperations.pdb
index 4f4abb982b3874890f2fd73f3c2a2508c9f40dad..63367a30929783ec9924c55cf0153135ca850952 100644
Binary files a/FourOperations/FourOperationsDemo/bin/Debug/netcoreapp3.1/FourOperations.pdb and b/FourOperations/FourOperationsDemo/bin/Debug/netcoreapp3.1/FourOperations.pdb differ
diff --git a/FourOperations/FourOperationsDemo/bin/Debug/netcoreapp3.1/FourOperationsDemo.dll b/FourOperations/FourOperationsDemo/bin/Debug/netcoreapp3.1/FourOperationsDemo.dll
index 9be142436bb3f92ed8e932e28c6fe757fa51e0d5..582f49943ca1df01bdbf5ccdadf9a040065895fd 100644
Binary files a/FourOperations/FourOperationsDemo/bin/Debug/netcoreapp3.1/FourOperationsDemo.dll and b/FourOperations/FourOperationsDemo/bin/Debug/netcoreapp3.1/FourOperationsDemo.dll differ
diff --git a/FourOperations/FourOperationsDemo/bin/Debug/netcoreapp3.1/FourOperationsDemo.pdb b/FourOperations/FourOperationsDemo/bin/Debug/netcoreapp3.1/FourOperationsDemo.pdb
index 09ac709254b22a65a2a6e72eefc238f305f91e2e..6d4861ba39b2095e0722c209af17e3a3209071db 100644
Binary files a/FourOperations/FourOperationsDemo/bin/Debug/netcoreapp3.1/FourOperationsDemo.pdb and b/FourOperations/FourOperationsDemo/bin/Debug/netcoreapp3.1/FourOperationsDemo.pdb differ
diff --git a/FourOperations/FourOperationsDemo/bin/Debug/netcoreapp3.1/FourOperationsDemo.runtimeconfig.dev.json b/FourOperations/FourOperationsDemo/bin/Debug/netcoreapp3.1/FourOperationsDemo.runtimeconfig.dev.json
index d0032b53f18cb5a4365e9bf6ebea969950bfa032..9261e2b5f56c4ae78967636f0eff02e318d7c051 100644
--- a/FourOperations/FourOperationsDemo/bin/Debug/netcoreapp3.1/FourOperationsDemo.runtimeconfig.dev.json
+++ b/FourOperations/FourOperationsDemo/bin/Debug/netcoreapp3.1/FourOperationsDemo.runtimeconfig.dev.json
@@ -1,10 +1,9 @@
 {
   "runtimeOptions": {
     "additionalProbingPaths": [
-      "C:\\Users\\linso\\.dotnet\\store\\|arch|\\|tfm|",
-      "C:\\Users\\linso\\.nuget\\packages",
-      "C:\\Microsoft\\Xamarin\\NuGet",
-      "C:\\Program Files\\dotnet\\sdk\\NuGetFallbackFolder"
+      "C:\\Users\\Administrator\\.dotnet\\store\\|arch|\\|tfm|",
+      "C:\\Users\\Administrator\\.nuget\\packages",
+      "C:\\Microsoft\\Xamarin\\NuGet"
     ]
   }
 }
\ No newline at end of file
diff --git a/FourOperations/FourOperationsDemo/obj/Debug/netcoreapp3.1/FourOperationsDemo.assets.cache b/FourOperations/FourOperationsDemo/obj/Debug/netcoreapp3.1/FourOperationsDemo.assets.cache
index a3a18ad17a6833729a8b6a6ca34ba4489972582a..3207f52ce0259c70aab9c6827cb7ca7d1a806e1e 100644
Binary files a/FourOperations/FourOperationsDemo/obj/Debug/netcoreapp3.1/FourOperationsDemo.assets.cache and b/FourOperations/FourOperationsDemo/obj/Debug/netcoreapp3.1/FourOperationsDemo.assets.cache differ
diff --git a/FourOperations/FourOperationsDemo/obj/Debug/netcoreapp3.1/FourOperationsDemo.csproj.CoreCompileInputs.cache b/FourOperations/FourOperationsDemo/obj/Debug/netcoreapp3.1/FourOperationsDemo.csproj.CoreCompileInputs.cache
index c6fb1017a6003bb5d96f61dd708191068759e687..850b1dcf8da62cb8ff0376b765bf398922adad71 100644
--- a/FourOperations/FourOperationsDemo/obj/Debug/netcoreapp3.1/FourOperationsDemo.csproj.CoreCompileInputs.cache
+++ b/FourOperations/FourOperationsDemo/obj/Debug/netcoreapp3.1/FourOperationsDemo.csproj.CoreCompileInputs.cache
@@ -1 +1 @@
-28185f74179fd8b064bf1d8d388623e7ced39cc1
+04596e1b8efd589518f66034a993dda38434eb88
diff --git a/FourOperations/FourOperationsDemo/obj/Debug/netcoreapp3.1/FourOperationsDemo.csprojAssemblyReference.cache b/FourOperations/FourOperationsDemo/obj/Debug/netcoreapp3.1/FourOperationsDemo.csprojAssemblyReference.cache
index 2e68b1e6bca4cb6591579933b7590e192049e556..2636452cda9825e8569c0e50305e5ff7ac33e766 100644
Binary files a/FourOperations/FourOperationsDemo/obj/Debug/netcoreapp3.1/FourOperationsDemo.csprojAssemblyReference.cache and b/FourOperations/FourOperationsDemo/obj/Debug/netcoreapp3.1/FourOperationsDemo.csprojAssemblyReference.cache differ
diff --git a/FourOperations/FourOperationsDemo/obj/Debug/netcoreapp3.1/FourOperationsDemo.dll b/FourOperations/FourOperationsDemo/obj/Debug/netcoreapp3.1/FourOperationsDemo.dll
index 9be142436bb3f92ed8e932e28c6fe757fa51e0d5..582f49943ca1df01bdbf5ccdadf9a040065895fd 100644
Binary files a/FourOperations/FourOperationsDemo/obj/Debug/netcoreapp3.1/FourOperationsDemo.dll and b/FourOperations/FourOperationsDemo/obj/Debug/netcoreapp3.1/FourOperationsDemo.dll differ
diff --git a/FourOperations/FourOperationsDemo/obj/Debug/netcoreapp3.1/FourOperationsDemo.pdb b/FourOperations/FourOperationsDemo/obj/Debug/netcoreapp3.1/FourOperationsDemo.pdb
index 09ac709254b22a65a2a6e72eefc238f305f91e2e..6d4861ba39b2095e0722c209af17e3a3209071db 100644
Binary files a/FourOperations/FourOperationsDemo/obj/Debug/netcoreapp3.1/FourOperationsDemo.pdb and b/FourOperations/FourOperationsDemo/obj/Debug/netcoreapp3.1/FourOperationsDemo.pdb differ
diff --git a/FourOperations/FourOperationsDemo/obj/FourOperationsDemo.csproj.nuget.dgspec.json b/FourOperations/FourOperationsDemo/obj/FourOperationsDemo.csproj.nuget.dgspec.json
index 7d8be77896a5de13f50e872cdc76245181fe37a1..b3c5726a6cd3cd99767f0a39bd763634c2345161 100644
--- a/FourOperations/FourOperationsDemo/obj/FourOperationsDemo.csproj.nuget.dgspec.json
+++ b/FourOperations/FourOperationsDemo/obj/FourOperationsDemo.csproj.nuget.dgspec.json
@@ -1,24 +1,23 @@
 {
   "format": 1,
   "restore": {
-    "C:\\Users\\linso\\Desktop\\新建文件夹 (2)\\FourOperations\\FourOperations\\FourOperationsDemo\\FourOperationsDemo.csproj": {}
+    "C:\\Users\\Administrator\\Desktop\\xin仓库\\FourOperations\\FourOperationsDemo\\FourOperationsDemo.csproj": {}
   },
   "projects": {
-    "C:\\Users\\linso\\Desktop\\新建文件夹 (2)\\FourOperations\\FourOperations\\FourOperationsDemo\\FourOperationsDemo.csproj": {
+    "C:\\Users\\Administrator\\Desktop\\xin仓库\\FourOperations\\FourOperationsDemo\\FourOperationsDemo.csproj": {
       "version": "1.0.0",
       "restore": {
-        "projectUniqueName": "C:\\Users\\linso\\Desktop\\新建文件夹 (2)\\FourOperations\\FourOperations\\FourOperationsDemo\\FourOperationsDemo.csproj",
+        "projectUniqueName": "C:\\Users\\Administrator\\Desktop\\xin仓库\\FourOperations\\FourOperationsDemo\\FourOperationsDemo.csproj",
         "projectName": "FourOperationsDemo",
-        "projectPath": "C:\\Users\\linso\\Desktop\\新建文件夹 (2)\\FourOperations\\FourOperations\\FourOperationsDemo\\FourOperationsDemo.csproj",
-        "packagesPath": "C:\\Users\\linso\\.nuget\\packages\\",
-        "outputPath": "C:\\Users\\linso\\Desktop\\新建文件夹 (2)\\FourOperations\\FourOperations\\FourOperationsDemo\\obj\\",
+        "projectPath": "C:\\Users\\Administrator\\Desktop\\xin仓库\\FourOperations\\FourOperationsDemo\\FourOperationsDemo.csproj",
+        "packagesPath": "C:\\Users\\Administrator\\.nuget\\packages\\",
+        "outputPath": "C:\\Users\\Administrator\\Desktop\\xin仓库\\FourOperations\\FourOperationsDemo\\obj\\",
         "projectStyle": "PackageReference",
         "fallbackFolders": [
-          "C:\\Microsoft\\Xamarin\\NuGet\\",
-          "C:\\Program Files\\dotnet\\sdk\\NuGetFallbackFolder"
+          "C:\\Microsoft\\Xamarin\\NuGet\\"
         ],
         "configFilePaths": [
-          "C:\\Users\\linso\\AppData\\Roaming\\NuGet\\NuGet.Config",
+          "C:\\Users\\Administrator\\AppData\\Roaming\\NuGet\\NuGet.Config",
           "C:\\Program Files (x86)\\NuGet\\Config\\Microsoft.VisualStudio.Offline.config",
           "C:\\Program Files (x86)\\NuGet\\Config\\Xamarin.Offline.config"
         ],
@@ -32,8 +31,8 @@
         "frameworks": {
           "netcoreapp3.1": {
             "projectReferences": {
-              "C:\\Users\\linso\\Desktop\\新建文件夹 (2)\\FourOperations\\FourOperations\\FourOperations\\FourOperations.csproj": {
-                "projectPath": "C:\\Users\\linso\\Desktop\\新建文件夹 (2)\\FourOperations\\FourOperations\\FourOperations\\FourOperations.csproj"
+              "C:\\Users\\Administrator\\Desktop\\xin仓库\\FourOperations\\FourOperations\\FourOperations.csproj": {
+                "projectPath": "C:\\Users\\Administrator\\Desktop\\xin仓库\\FourOperations\\FourOperations\\FourOperations.csproj"
               }
             }
           }
@@ -65,21 +64,20 @@
         }
       }
     },
-    "C:\\Users\\linso\\Desktop\\新建文件夹 (2)\\FourOperations\\FourOperations\\FourOperations\\FourOperations.csproj": {
+    "C:\\Users\\Administrator\\Desktop\\xin仓库\\FourOperations\\FourOperations\\FourOperations.csproj": {
       "version": "1.0.0",
       "restore": {
-        "projectUniqueName": "C:\\Users\\linso\\Desktop\\新建文件夹 (2)\\FourOperations\\FourOperations\\FourOperations\\FourOperations.csproj",
+        "projectUniqueName": "C:\\Users\\Administrator\\Desktop\\xin仓库\\FourOperations\\FourOperations\\FourOperations.csproj",
         "projectName": "FourOperations",
-        "projectPath": "C:\\Users\\linso\\Desktop\\新建文件夹 (2)\\FourOperations\\FourOperations\\FourOperations\\FourOperations.csproj",
-        "packagesPath": "C:\\Users\\linso\\.nuget\\packages\\",
-        "outputPath": "C:\\Users\\linso\\Desktop\\新建文件夹 (2)\\FourOperations\\FourOperations\\FourOperations\\obj\\",
+        "projectPath": "C:\\Users\\Administrator\\Desktop\\xin仓库\\FourOperations\\FourOperations\\FourOperations.csproj",
+        "packagesPath": "C:\\Users\\Administrator\\.nuget\\packages\\",
+        "outputPath": "C:\\Users\\Administrator\\Desktop\\xin仓库\\FourOperations\\FourOperations\\obj\\",
         "projectStyle": "PackageReference",
         "fallbackFolders": [
-          "C:\\Microsoft\\Xamarin\\NuGet\\",
-          "C:\\Program Files\\dotnet\\sdk\\NuGetFallbackFolder"
+          "C:\\Microsoft\\Xamarin\\NuGet\\"
         ],
         "configFilePaths": [
-          "C:\\Users\\linso\\AppData\\Roaming\\NuGet\\NuGet.Config",
+          "C:\\Users\\Administrator\\AppData\\Roaming\\NuGet\\NuGet.Config",
           "C:\\Program Files (x86)\\NuGet\\Config\\Microsoft.VisualStudio.Offline.config",
           "C:\\Program Files (x86)\\NuGet\\Config\\Xamarin.Offline.config"
         ],
diff --git a/FourOperations/FourOperationsDemo/obj/FourOperationsDemo.csproj.nuget.g.props b/FourOperations/FourOperationsDemo/obj/FourOperationsDemo.csproj.nuget.g.props
index a6c665ef69fd4e1484541861fdddecf05fba6c86..8653c9659ec4e810564ca072fb9c05fa8261cd48 100644
--- a/FourOperations/FourOperationsDemo/obj/FourOperationsDemo.csproj.nuget.g.props
+++ b/FourOperations/FourOperationsDemo/obj/FourOperationsDemo.csproj.nuget.g.props
@@ -5,7 +5,7 @@
     <RestoreTool Condition=" '$(RestoreTool)' == '' ">NuGet</RestoreTool>
     <ProjectAssetsFile Condition=" '$(ProjectAssetsFile)' == '' ">$(MSBuildThisFileDirectory)project.assets.json</ProjectAssetsFile>
     <NuGetPackageRoot Condition=" '$(NuGetPackageRoot)' == '' ">$(UserProfile)\.nuget\packages\</NuGetPackageRoot>
-    <NuGetPackageFolders Condition=" '$(NuGetPackageFolders)' == '' ">C:\Users\linso\.nuget\packages\;C:\Microsoft\Xamarin\NuGet\;C:\Program Files\dotnet\sdk\NuGetFallbackFolder</NuGetPackageFolders>
+    <NuGetPackageFolders Condition=" '$(NuGetPackageFolders)' == '' ">C:\Users\Administrator\.nuget\packages\;C:\Microsoft\Xamarin\NuGet\</NuGetPackageFolders>
     <NuGetProjectStyle Condition=" '$(NuGetProjectStyle)' == '' ">PackageReference</NuGetProjectStyle>
     <NuGetToolVersion Condition=" '$(NuGetToolVersion)' == '' ">5.5.0</NuGetToolVersion>
   </PropertyGroup>
diff --git a/FourOperations/FourOperationsDemo/obj/project.assets.json b/FourOperations/FourOperationsDemo/obj/project.assets.json
index 71e0c47209addc19ba7683fff8117ee4e01ed351..ae06eb5cc2164e16c4b7de28bfedbf2b4fe7edf7 100644
--- a/FourOperations/FourOperationsDemo/obj/project.assets.json
+++ b/FourOperations/FourOperationsDemo/obj/project.assets.json
@@ -27,25 +27,23 @@
     ]
   },
   "packageFolders": {
-    "C:\\Users\\linso\\.nuget\\packages\\": {},
-    "C:\\Microsoft\\Xamarin\\NuGet\\": {},
-    "C:\\Program Files\\dotnet\\sdk\\NuGetFallbackFolder": {}
+    "C:\\Users\\Administrator\\.nuget\\packages\\": {},
+    "C:\\Microsoft\\Xamarin\\NuGet\\": {}
   },
   "project": {
     "version": "1.0.0",
     "restore": {
-      "projectUniqueName": "C:\\Users\\linso\\Desktop\\新建文件夹 (2)\\FourOperations\\FourOperations\\FourOperationsDemo\\FourOperationsDemo.csproj",
+      "projectUniqueName": "C:\\Users\\Administrator\\Desktop\\xin仓库\\FourOperations\\FourOperationsDemo\\FourOperationsDemo.csproj",
       "projectName": "FourOperationsDemo",
-      "projectPath": "C:\\Users\\linso\\Desktop\\新建文件夹 (2)\\FourOperations\\FourOperations\\FourOperationsDemo\\FourOperationsDemo.csproj",
-      "packagesPath": "C:\\Users\\linso\\.nuget\\packages\\",
-      "outputPath": "C:\\Users\\linso\\Desktop\\新建文件夹 (2)\\FourOperations\\FourOperations\\FourOperationsDemo\\obj\\",
+      "projectPath": "C:\\Users\\Administrator\\Desktop\\xin仓库\\FourOperations\\FourOperationsDemo\\FourOperationsDemo.csproj",
+      "packagesPath": "C:\\Users\\Administrator\\.nuget\\packages\\",
+      "outputPath": "C:\\Users\\Administrator\\Desktop\\xin仓库\\FourOperations\\FourOperationsDemo\\obj\\",
       "projectStyle": "PackageReference",
       "fallbackFolders": [
-        "C:\\Microsoft\\Xamarin\\NuGet\\",
-        "C:\\Program Files\\dotnet\\sdk\\NuGetFallbackFolder"
+        "C:\\Microsoft\\Xamarin\\NuGet\\"
       ],
       "configFilePaths": [
-        "C:\\Users\\linso\\AppData\\Roaming\\NuGet\\NuGet.Config",
+        "C:\\Users\\Administrator\\AppData\\Roaming\\NuGet\\NuGet.Config",
         "C:\\Program Files (x86)\\NuGet\\Config\\Microsoft.VisualStudio.Offline.config",
         "C:\\Program Files (x86)\\NuGet\\Config\\Xamarin.Offline.config"
       ],
@@ -59,8 +57,8 @@
       "frameworks": {
         "netcoreapp3.1": {
           "projectReferences": {
-            "C:\\Users\\linso\\Desktop\\新建文件夹 (2)\\FourOperations\\FourOperations\\FourOperations\\FourOperations.csproj": {
-              "projectPath": "C:\\Users\\linso\\Desktop\\新建文件夹 (2)\\FourOperations\\FourOperations\\FourOperations\\FourOperations.csproj"
+            "C:\\Users\\Administrator\\Desktop\\xin仓库\\FourOperations\\FourOperations\\FourOperations.csproj": {
+              "projectPath": "C:\\Users\\Administrator\\Desktop\\xin仓库\\FourOperations\\FourOperations\\FourOperations.csproj"
             }
           }
         }
diff --git a/FourOperations/FourOperationsDemo/obj/project.nuget.cache b/FourOperations/FourOperationsDemo/obj/project.nuget.cache
index 31a67b4ffa328cdbb6e4ec7cc778edbda726e093..9503183332bcc46750e7678b2a9300b53c996d77 100644
--- a/FourOperations/FourOperationsDemo/obj/project.nuget.cache
+++ b/FourOperations/FourOperationsDemo/obj/project.nuget.cache
@@ -1,8 +1,8 @@
 {
   "version": 2,
-  "dgSpecHash": "vHszkrHo0/fqRV/6S0wAOl6uG+WvsQLfmXZgjgoM4LvYJdHICJYx91UivyllNAS7NJJDTpKyslocX6upLDzsQw==",
+  "dgSpecHash": "S98W87nanApxm35KH8yBkRK+E1Ojl86nchIJEDtbH31UrjpV/PHF7g3Jg9MnGmyVInpeniMydIa9s9lz4a69PA==",
   "success": true,
-  "projectFilePath": "C:\\Users\\linso\\Desktop\\新建文件夹 (2)\\FourOperations\\FourOperations\\FourOperationsDemo\\FourOperationsDemo.csproj",
+  "projectFilePath": "C:\\Users\\Administrator\\Desktop\\xin仓库\\FourOperations\\FourOperationsDemo\\FourOperationsDemo.csproj",
   "expectedPackageFiles": [],
   "logs": []
 }
\ No newline at end of file
diff --git "a/FourOperations/FourOperationsDemo/\346\211\223\345\215\260\346\226\207\344\273\266Add.xml" "b/FourOperations/FourOperationsDemo/\346\211\223\345\215\260\346\226\207\344\273\266Add.xml"
new file mode 100644
index 0000000000000000000000000000000000000000..090e30019670f06bb0c6c758e8b9cde995cfb52d
--- /dev/null
+++ "b/FourOperations/FourOperationsDemo/\346\211\223\345\215\260\346\226\207\344\273\266Add.xml"
@@ -0,0 +1,23 @@
+<?xml version="1.0" encoding="utf-8"?>
+<生成题目>
+  <题目>0+19</题目>
+  <答案>19</答案>
+  <题目>2+2</题目>
+  <答案>4</答案>
+  <题目>7+4</题目>
+  <答案>11</答案>
+  <题目>10+8</题目>
+  <答案>18</答案>
+  <题目>5+1</题目>
+  <答案>6</答案>
+  <题目>19+14</题目>
+  <答案>33</答案>
+  <题目>0+7</题目>
+  <答案>7</答案>
+  <题目>18+13</题目>
+  <答案>31</答案>
+  <题目>12+15</题目>
+  <答案>27</答案>
+  <题目>15+11</题目>
+  <答案>26</答案>
+</生成题目>
\ No newline at end of file