题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105122347-19491.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105122347-29821.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105122347-68197.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105122348-90576.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105122348-24867.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105122348-46514.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105122348-24867.png)
解析
试题分析:如图所示:设
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105122348-28023.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105122349-76821.png)
由于
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105122349-52209.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105122349-38985.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105122349-27801.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105122350-72490.png)
即
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105122350-82129.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105122350-66975.png)
由于C为锐角,∴
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105122350-59529.png)
∵
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105122351-38557.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105122347-19491.png)
∵
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105122347-29821.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105122347-68197.png)
∴当
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105122351-61563.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105122348-46514.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105122351-38031.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105122351-42392.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105122338-93116.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105122338-22344.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105122338-93116.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105122339-60579.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105122339-27360.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105122339-64197.png)
①动点P满足
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105122339-64888.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105122339-28793.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105122339-60579.png)
②动点P满足
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105122339-64888.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105122339-78105.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105122339-60579.png)
③动点P满足
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105122339-64888.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105122339-82905.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105122339-60579.png)
④动点P满足
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105122339-64888.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105122339-21060.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105122339-60579.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105122328-40525.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105122328-65426.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105122328-24274.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105122329-75885.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105122329-47021.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105122329-38044.png)
A.0 | B.![]() | C.![]() | D.4 |
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105122324-92675.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105122315-42949.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105122315-94838.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105122315-45176.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105122316-63906.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105122310-37446.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105122311-61953.jpg)
A.正方形 | B.梯形 | C.菱形 | D.矩形 |
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