diff --git a/知识点/MathJax数学公式.md b/知识点/MathJax数学公式.md
index 3dbed89..0970dc0 100644
--- a/知识点/MathJax数学公式.md
+++ b/知识点/MathJax数学公式.md
@@ -19,8 +19,8 @@
 方程组
 
 $
-\begin{cases}
-1+1=2 \\\\
-2+2=4
-\end{cases}
+    \begin{cases}
+    2+1=2 \\\\
+    2+2=4
+    \end{cases}
 $
diff --git a/问题/均贫富.md b/问题/均贫富.md
index a2e157e..a50e6ea 100644
--- a/问题/均贫富.md
+++ b/问题/均贫富.md
@@ -7,22 +7,17 @@
 问：明明给小强几张邮票后两个人的邮票就一样多了？
 ```
 
-$$ a - x = b + x \qaud (a \in \Bbb{N}, b \in \Bbb{N}, a>b) $$
+$ a - x = b + x \quad (a \in \Bbb{N}, b \in \Bbb{N}, a>b) $
 
 ## 解法1
 
-$ \begin{aligned} 2x &= a - b  &(移项并交换等式两侧) \newline x &=\frac{a-b}{2}  &(等式两侧同除以2) \end{aligned} $
+$
+\begin{aligned}
+2x &= a - b  &(移项并交换等式两侧) \\\\
+ x &= \frac{a-b}{2}  &(等式两侧同除以2)
+\end{aligned}
+$
 
 ## 解法2
 
-$$ x = \frac{a+b}{2} - b $$
-
-`x = \frac{a+b}{2} - b`
-
 $ x = \frac{a+b}{2} - b $
-
-```math
-x = \frac{a+b}{2} - b
-```
-
-