diff --git a/README.md b/README.md
index 51490ed..7450f32 100644
--- a/README.md
+++ b/README.md
@@ -1,8 +1,7 @@
 # Android：海天鹰浏览器
 $$\left. \frac{{\rm d}u}{{\rm d}x} \right| _{x=0}$$
 
-$$
-f\left(
+$$f\left(
    \left[ 
      \frac{
        1+\left\\{x,y\right\\}
@@ -14,8 +13,7 @@ f\left(
      }+a
    \right]^{3/2}
 \right)
-\tag {行标}
-$$
+\tag {行标}$$
 
 $\sum_{i=0}^n i^2 = \frac{(n^2+n)(2n+1)}{6}$