From e40a7938ebc7f876da7268251557b79f34b2f383 Mon Sep 17 00:00:00 2001
From: 123456 <hoochanlon@outlook.com>
Date: Fri, 30 Jun 2023 23:59:50 +0800
Subject: [PATCH] Update readme.md

---
 有趣的3/readme.md | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/有趣的3/readme.md b/有趣的3/readme.md
index fb61961..b9381bf 100644
--- a/有趣的3/readme.md
+++ b/有趣的3/readme.md
@@ -4,6 +4,8 @@
 * https://www.mathsisfun.com
 * https://www.purplemath.com
 
+知乎 - 有什么学习数学的好网站？ https://www.zhihu.com/question/19559151
+
 学术搜索库
 
 * 清华大学图书馆推荐网络学术站点系统：https://wr.lib.tsinghua.edu.cn