fix(vector): fix #2385

diff --git a/docs/math/vector.md b/docs/math/vector.md
index a0d59b7..891424a 100644 (file)
--- a/docs/math/vector.md
+++ b/docs/math/vector.md
@@ -152,7 +152,7 @@ $$
 
 #### 判定两向量共线
 
- $\boldsymbol a = \lambda \boldsymbol b$  $\Leftrightarrow$  $\boldsymbol a\cdot \boldsymbol b=|\boldsymbol a||\boldsymbol b|$ 
+ $\boldsymbol a = \lambda \boldsymbol b$  $\Leftrightarrow$  $|\boldsymbol a\cdot \boldsymbol b|=|\boldsymbol a||\boldsymbol b|$ 
 
 #### 数量积的坐标运算