题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102230730-93616.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102230730-72453.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102230730-43938.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102230730-43570.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102230731-42890.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102230731-62978.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102230731-12158.png)
(1)求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102230731-69418.png)
(2)当
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102230732-40540.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102230732-38559.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102230732-62071.png)
答案
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102230730-93616.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102230733-82688.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102230733-79646.png)
∵
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102230730-43938.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102230730-72453.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102230733-79813.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102230733-56688.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102230731-69418.png)
(2)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102230734-62879.png)
∴△
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102230734-82722.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102230734-60477.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102230734-17638.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102230735-30923.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102230726-26973.jpg)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102230722-19604.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102230717-92472.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102230718-60935.png)
A.①②⑤ B.②③④ C.③④⑤ D.①④⑤
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102230710-61458.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102230710-48210.png)
求证:AB2=AD·AC;
(2)(4分)如图②,在Rt△ABC中,∠ABC=90°,点D为BC边上的点,BE⊥AD于点E,延长BE交AC
于点F.
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102230653-67248.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102230654-39486.png)
(3)(5分) 在Rt△ABC中,∠ABC=90°,点D为直线BC上的动点(点D不与B、C重合),直线BE⊥AD
于点E,交直线AC于点F。若
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102230654-79133.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102230654-39486.png)
示),不必证明.
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102230654-24219.jpg)
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