题目
题型:不详难度:来源:
求证:(1)
![](http://img.shitiku.com.cn/uploads/allimg/20191107/20191107230822-11486.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191107/20191107230823-97594.gif)
(2)DE
![](http://img.shitiku.com.cn/uploads/allimg/20191107/20191107230823-18520.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191107/20191107230823-18520.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191107/20191107230823-76328.jpg)
答案
(2)证明略
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191107/20191107230822-11486.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191107/20191107230823-97594.gif)
(2)由
![](http://img.shitiku.com.cn/uploads/allimg/20191107/20191107230822-11486.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191107/20191107230823-97594.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191107/20191107230824-76287.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191107/20191107230824-67490.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191107/20191107230824-67122.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191107/20191107230824-47968.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191107/20191107230825-77762.gif)
核心考点
试题【(本小题满分12分)如图,在等腰梯形ABCD中,AD∥BC,AB=DC,过点D作AC的平行线DE,交BA的延长线于点E。求证:(1)≌;(2)DEDC=AEBD】;主要考察你对相似三角形的判定及有关性质等知识点的理解。[详细]
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191107/20191107230819-98949.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191107/20191107230819-12101.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191107/20191107230819-72994.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191107/20191107230819-48845.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191107/20191107230814-52181.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191107/20191107230815-17831.gif)
已知
![](http://img.shitiku.com.cn/uploads/allimg/20191107/20191107230802-35557.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191107/20191107230802-80807.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191107/20191107230803-84872.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191107/20191107230803-11965.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191107/20191107230802-80807.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191107/20191107230803-91692.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191107/20191107230803-27693.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191107/20191107230803-77295.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191107/20191107230803-92905.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191107/20191107230804-54461.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191107/20191107230804-80292.gif)
(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20191107/20191107230804-15126.gif)
(2)若
![](http://img.shitiku.com.cn/uploads/allimg/20191107/20191107230804-49333.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191107/20191107230805-47513.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191107/20191107230805-14812.gif)
如图:如图E、F、G、H为凸四边形ABCD中AC、BD、AD、DC的中点,∠ABC=∠ADC。
![](http://img.shitiku.com.cn/uploads/allimg/20191107/20191107230758-67575.gif)
(1)求证:∠ADC=∠GEH; (3分)
(2)求证:E、F、G、H四点共圆; (4分)
(3)求证:∠AEF=∠ACB-∠ACD (3分)
21.(选做题)本大题包括A,B,C,D共4小题,请从这4题中选做2小题. 每小题10分,共20分.请在答题卡上准确填涂题目标记. 解答时应写出文字说明、证明过程或演算步骤.
A. 选修4-1:几何证明选讲
如图,
![](http://img.shitiku.com.cn/uploads/allimg/20191107/20191107230752-40100.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191107/20191107230752-26647.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191107/20191107230753-52950.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191107/20191107230753-40858.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191107/20191107230753-90553.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191107/20191107230753-12025.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191107/20191107230754-17623.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191107/20191107230754-75584.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191107/20191107230754-14539.gif)
(1)求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191107/20191107230754-14539.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191107/20191107230754-75584.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191107/20191107230754-77553.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191107/20191107230755-85482.gif)
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