题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029113822-81321.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029113823-71278.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029113823-37348.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029113824-15723.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029113822-81321.png)
(1)求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029113824-37356.png)
(2)若
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029113824-98782.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029113825-29951.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029113825-95702.jpg)
答案
(2)见解析
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029113823-71278.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029113825-58508.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029113826-39102.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029113823-37348.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029113826-38161.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029113826-46184.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029113826-73744.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029113827-36362.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029113827-48762.png)
(2)由(1)可知
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029113827-15492.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029113824-98782.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029113822-81321.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029113828-27076.png)
再由
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029113826-46184.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029113753-77775.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029113754-76490.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029113757-72363.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029113758-43423.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029113758-77826.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029113758-97724.png)
(1)如果
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029113758-47060.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029113759-50852.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029113759-65561.png)
(2)如果
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029113759-28240.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029113759-50852.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029113759-65561.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029113800-77146.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029113700-42865.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029113700-98901.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029113700-43281.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029113701-48304.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029113701-59077.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029113701-68439.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029113701-79660.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029113701-87881.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029113702-97111.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029113722-83758.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029113722-50736.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029113722-73407.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029113723-90006.png)
(1)若
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029113723-53984.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029113723-29779.png)
(2)若
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029113723-98485.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029113724-60303.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029113646-73475.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029113646-54867.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029113647-54310.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029113647-14170.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029113647-93571.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029113647-95353.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029113647-47183.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029113648-54683.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029113648-55375.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029113648-66527.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029113648-67865.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029113647-14170.png)
(1)用含t的代数式表示AN=___________cm;
(2)当t为何值时,
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029113649-13435.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029113646-73475.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029113649-61728.png)
(2)是否存在时刻
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029113649-68808.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029113649-35404.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029113650-75778.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029113649-68808.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029113650-34807.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029113625-64712.png)
(1)求证:四边形EFGH为正方形;
(2)若AD=4,BC=6,求四边形EFGH的面积.
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029113625-64098.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029113614-29485.png)
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