题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029001403-61574.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029001403-68246.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029001404-20984.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029001404-83876.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029001403-61574.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029001404-26625.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029001404-89697.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029001404-38605.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029001405-58044.png)
(1)求证:四边形
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029001405-83460.png)
(2)当
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029001403-61574.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029001405-83460.png)
答案
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029001405-32936.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029001406-46778.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029001406-59756.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029001406-87084.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029001407-85425.png)
∵
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029001407-66955.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029001407-21421.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029001407-46996.png)
∴ ∠
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029001408-47826.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029001408-14133.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029001408-53022.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029001408-28732.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029001409-18235.png)
又∵
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029001406-59756.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029001409-47445.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029001409-65907.png)
∴ 四边形
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029001405-83460.png)
(2)解:给出正确条件即可.
例如,当
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029001409-39779.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029001405-83460.png)
∵
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029001406-46778.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029001406-59756.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029001410-60627.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029001410-46392.png)
又∵
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029001409-39779.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029001410-73153.png)
由(1)知四边形
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029001405-83460.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029001405-83460.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029001258-65790.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029001258-72308.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029001258-47946.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029001258-69660.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029001259-41062.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029001122-39348.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029001122-30786.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029001122-56254.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029001122-98227.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029001123-74651.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029001123-59878.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029001123-74596.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029001123-36794.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029001124-98113.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029001124-62976.png)
(1)求证:四边形
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029001124-55100.png)
(2)若
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029001125-20125.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029001125-33153.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029001125-53665.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029001015-58386.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029001016-53306.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029001016-15519.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029001016-12129.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029001016-65034.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029001017-69434.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029001017-42076.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029001017-95510.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029001017-92633.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029001018-80407.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029001018-26124.png)
(1)求证:四边形
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029001018-87120.png)
(2)若
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029001019-89331.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029001019-45580.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029001019-37254.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029001019-45580.png)
(3)在线段
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029001020-95370.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029001020-66549.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029001020-26562.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029001020-66549.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029000959-43946.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029000959-45302.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029000959-21106.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029001000-38508.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029001000-96759.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029001000-28831.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029001000-95685.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029001000-67361.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029001001-95689.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029000942-98593.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029000943-93892.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029000943-57634.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029000943-32981.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029000943-13408.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029000943-89439.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029000944-55791.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029000944-47917.png)
(1)求证:△
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029000944-79192.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029000944-69888.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029000945-49413.png)
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