diff --git a/06-matplotlib/06.04-working-with-text---math-expression.ipynb b/06-matplotlib/06.04-working-with-text---math-expression.ipynb
index a36032f6..e968e039 100644
--- a/06-matplotlib/06.04-working-with-text---math-expression.ipynb
+++ b/06-matplotlib/06.04-working-with-text---math-expression.ipynb
@@ -208,7 +208,7 @@
     "`\\grave a`| $\\grave a$\n",
     "`\\hat a`| $\\hat a$\n",
     "`\\tilde a` | $\\tilde a$\n",
-    "`\\4vec a` | $\\vec a$\n",
+    "`\\vec a` | $\\vec a$\n",
     "`\\overline{abc}`|$\\overline{abc}$\n",
     "`\\widehat{xyz}`|$\\widehat{xyz}$\n",
     "`\\widetilde{xyz}`|$\\widetilde{xyz}$"
diff --git a/06-matplotlib/06.09-do-not-trust-the-defaults.ipynb b/06-matplotlib/06.09-do-not-trust-the-defaults.ipynb
index 2e050f92..8d2b1835 100644
--- a/06-matplotlib/06.09-do-not-trust-the-defaults.ipynb
+++ b/06-matplotlib/06.09-do-not-trust-the-defaults.ipynb
@@ -571,7 +571,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "我们可以使用 `anotate` 函数来注释特殊的点，假设我们要显示的点是 $2\\pi/3$："
+    "我们可以使用 `annotate` 函数来注释特殊的点，假设我们要显示的点是 $2\\pi/3$："
    ]
   },
   {