diff --git a/问题/均贫富.md b/问题/均贫富.md
index 3d196c4..385f366 100644
--- a/问题/均贫富.md
+++ b/问题/均贫富.md
@@ -7,7 +7,7 @@
 问：明明给小强几张邮票后两个人的邮票就一样多了？
 ```
 
-\[a - x = b + x \qaud (a \in \Bbb{N}, b \in \Bbb{N}, a>b) \]
+$$ a - x = b + x \qaud (a \in \Bbb{N}, b \in \Bbb{N}, a>b) $$
 
 ## 解法1
 
@@ -15,4 +15,6 @@ $ \begin{aligned} 2x &= a - b  &(移项并交换等式两侧) \newline x &=\frac
 
 ## 解法2
 
-$ x = \frac{a+b}{2} - b $
+$$ x = \frac{a+b}{2} - b $$
+
+\(x = \frac{a+b}{2} - b \)