题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108003522-13948.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108003522-43236.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108003522-79145.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108003523-55253.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108003522-43236.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108003523-30949.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108003523-67123.png)
(1)证明:
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108003523-31533.png)
(2)证明:
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108003524-77033.png)
答案
解析
试题分析:(1)由切割线定理得
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108003524-35494.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108003524-54890.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108003525-95795.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108003525-48386.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108003525-26794.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108003525-75607.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108003525-28763.png)
,由(1)知
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108003526-13147.png)
试题解析:(1)∵
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108003526-72710.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108003526-66201.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108003524-35494.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108003524-54890.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108003525-95795.png)
(2)由(1)有
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108003526-23080.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108003527-84005.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108003527-88774.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108003527-11882.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108003526-13147.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108003527-11882.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108003527-80165.png)
又
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108003527-84005.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108003528-27838.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108003527-11882.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108003528-89747.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108003527-11882.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108003528-71039.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108003508-63796.png)
(Ⅰ)求证:直线AB是⊙O的切线;
(Ⅱ)若tan∠CED=
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108003508-47099.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108003456-25700.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108003456-38106.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108003457-54423.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108003457-58943.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108003457-89443.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108003457-24363.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108003458-91709.jpg)
(1)若
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108003458-41564.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108003458-65332.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108003459-24188.png)
(2)若
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108003459-70533.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108003459-99711.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108003448-14840.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108003448-47046.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108003440-29565.jpg)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108003437-65134.jpg)
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