题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108012839-27892.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108012840-58361.gif)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108012840-38392.gif)
解析
∵ BD=CD,DG∥BF,∴ CG=GF
同样地,在△ADG中,∵ AE=DE,EF∥DG,∴ AF=FG
∴ AF=FG=CG,即
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108012840-66016.gif)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108012836-91903.jpg)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108012832-22153.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108012832-44215.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108012833-31157.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108012833-24055.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108012833-95216.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108012833-96945.jpg)
A. AC | B.平面AC | C.AB | D.平面AB |
22.选修4-1:几何证明选讲
如图,已知
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108012811-95941.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108012812-12261.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108012812-67138.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108012812-89269.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108012812-12261.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108012812-12261.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108012812-58289.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108012812-12261.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108012812-39315.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108012812-62647.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108012812-98080.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108012812-96737.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108012813-35226.jpg)
(1)证明
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108012813-64062.gif)
(2)求
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108012813-93216.gif)
23.选修4—4:坐标系与参数方程
已知直线
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108012813-88417.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108012813-32463.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108012814-58600.gif)
(1)写出直线
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108012813-88417.gif)
(2)设
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108012813-88417.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108012814-46704.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108012814-87851.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108012812-67138.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108012814-87851.gif)
24.选修4—5:不等式证明选讲
若不等式
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108012814-44494.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108012815-85690.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108012815-37186.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108012815-66082.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108012804-78932.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108012804-48853.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108012804-12125.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108012804-29054.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108012805-70894.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108012805-62406.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108012805-92539.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108012805-69010.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108012806-93388.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108012806-63923.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108012806-90642.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108012806-38172.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108012804-48853.png)
积为
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108012806-49439.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
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