diff --git a/Blockchain/part2_Solidity基础.md b/Blockchain/part2_Solidity基础.md
index c17f1e4..2ed530e 100644
--- a/Blockchain/part2_Solidity基础.md
+++ b/Blockchain/part2_Solidity基础.md
@@ -984,7 +984,7 @@ contract C {
 
 ## 四、练习题
 
-### 4.1`将固定长度字节数组转化为`string类型
+### 4.1 将固定长度字节数组转化为`string`类型
 
 ```javascript
 pragma solidity ^0.4.0;
@@ -998,7 +998,8 @@ contract bytes32tostring{
 }
 ```
 
-### 4.2 
+### 4.2 实现一个带有简单逻辑判断及多种数学运算的Solidity程序
+
 
 
 **参考自：**
@@ -1009,4 +1010,4 @@ contract bytes32tostring{
     [INlinKC](https://blog.csdn.net/weixin_45067603)
     https://ethfans.org/wikis/Home
 3. 以太坊solidity学习记录: [https://blog.csdn.net/weixin_45067603/article/details/105726491](https://blog.csdn.net/weixin_45067603/article/details/105726491)
-4. [尚硅谷区块链全套Go语言→GoWeb→以太坊→项目实战](https://www.bilibili.com/video/BV1sJ411D72u)
\ No newline at end of file
+4. [尚硅谷区块链全套Go语言→GoWeb→以太坊→项目实战](https://www.bilibili.com/video/BV1sJ411D72u)