题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102708-25954.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102708-56504.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102708-56852.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102708-61880.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102708-50702.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102709-18063.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102709-35190.png)
(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102709-55224.png)
(2)当锐角
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102708-61880.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102709-55224.png)
答案
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102708-25954.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102709-89550.png)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102710-29284.png)
因为
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102708-50702.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102709-18063.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102708-56852.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102708-61880.png)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102710-51400.png)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102710-60241.png)
(2)当锐角∠AOC的大小发生改变时,∠MON的大小不发生改变.
因为
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102710-22943.png)
又
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102711-52894.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102711-25036.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102658-98601.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102659-67559.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102659-36136.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102659-40273.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102659-21456.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102700-50968.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102700-37254.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102700-60502.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102700-53150.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102650-89789.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102650-91027.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102650-93573.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102650-99955.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102651-27925.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102651-91342.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102651-68491.png)
(1)若线段
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102651-22089.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102650-91027.png)
(2)若线段
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102652-60044.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102652-75177.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102643-75342.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102643-71133.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102643-97091.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102643-21143.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102643-43736.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102643-21143.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102644-62741.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102644-50947.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102644-95654.png)
A.4 | B.3 | C.2 | D.1 |
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102637-28232.png)
A.直线AB与直线BA是同一条直线 |
B.射线OA与射线OB是同一条射线 |
C.射线OA与射线AB是同一条射线 |
D.线段AB与线段BA是同一条线段 |
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102630-22116.png)
A.A-C-G-E-B | B.A-C-E-B |
C.A-D-G-E-B | D.A-F-E-B |
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