diff --git a/source/_posts/homework5.md b/source/_posts/homework5.md
index e87721d..bcaa6a7 100644
--- a/source/_posts/homework5.md
+++ b/source/_posts/homework5.md
@@ -15,7 +15,7 @@ tags:
 
 # P165-3
 
-求一个 $3 \times 3$ 的整型矩阵对角线元素之和/
+求一个 $3 \times 3$ 的整型矩阵对角线元素之和
 
 # P165-6