diff --git a/docs/nlp/2.分词.md b/docs/nlp/2.分词.md
index 93c7d118..44420de3 100644
--- a/docs/nlp/2.分词.md
+++ b/docs/nlp/2.分词.md
@@ -358,7 +358,7 @@ dict[(A, A)] = 1
 dict[(A, D)] = 2
 
 第一次 index = 1
-dict[(B, A)] = 3
+dict[(B, A)] = 1
 dict[(B, B)] = 1
 dict[(B, C)] = 2
 dict[(B, D)] = 1
@@ -375,7 +375,7 @@ A, C => 5
 所有 C => 15
 总共: 10个单词
 A 权重PR值: 1/10 = 0.1
-s_A = 20/50) * 0.1 + 5/15 * 0.1
+s_A = 20/50 * 0.1 + 5/15 * 0.1
 d阻尼系数，即按照超链接进行浏览的概率，一般取经验值为0.85
 1−d浏览者随机跳转到一个新网页的概率
 A 权重PR值: (1 - d) + d * s_A