diff --git a/docs/numpy-essentials/0.md b/docs/numpy-essentials/0.md
index 444a3cae41e0c23f52aa842303a04e2b59fefc18..3a1b117375dc09fbbf3fb40a1f50ddc37b6753da 100644
--- a/docs/numpy-essentials/0.md
+++ b/docs/numpy-essentials/0.md
@@ -58,14 +58,14 @@ In [42]: print("Hello, World!")
 任何命令行输入或输出的编写方式如下：
 
 ```py
-**In [6]: x
+In [6]: x
 Out[6]:
 array([[1, 2, 3],
        [2, 3, 4]])
 In [7]: x[0,0]
 Out[7]: 1
 In [8]: x[1,2]
-Out[8]: 4**
+Out[8]: 4
 
 ```
 
diff --git a/docs/numpy-essentials/1.md b/docs/numpy-essentials/1.md
index f1bb71bc0fa6e61df9ddfddcf553a8056ce1349b..1294661103af76eef90ffe9911efae5836fa6806 100644
--- a/docs/numpy-essentials/1.md
+++ b/docs/numpy-essentials/1.md
@@ -122,7 +122,7 @@ Windows OS 用户注意事项：除了 Python 发行版，您还可以从 [Ghris
 $ pip install numpy
 $ easy_install numpy
 $ enpkg numpy # for Canopy users
-$ conda install numpy # for Anaconda users**
+$ conda install numpy # for Anaconda users
 
 ```
 
diff --git a/docs/numpy-essentials/9.md b/docs/numpy-essentials/9.md
index 2e79ddbc524e8bfee5898a5f4f3710a92c1f263b..2f91da99f53ea11a1ad66cf60bac0911df226d3b 100644
--- a/docs/numpy-essentials/9.md
+++ b/docs/numpy-essentials/9.md
@@ -222,7 +222,7 @@ return NULL;
 ```c
 /*  iterate over the arrays */ 
 do { 
-**out_dataptr =pow(**in_dataptr,2); 
+    out_dataptr =pow(**in_dataptr,2); 
 } while(in_iternext(in_iter) && out_iternext(out_iter)); 
 
 /*  clean up and return the result */