题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103092821-83145.gif)
已知:EC∥AF, , ,
求证: .
证明
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103092822-71604.jpg)
答案
求证:BE=CF. …………………2分
证明:∵EG∥AF, ∴∠EGD=∠FCD, ∠EGB=∠ACB. ……………………………3分
∵AB="AC," ∴∠B=∠ACB. ∴∠B=∠EGB, ∴BE="EG. " ……………………………5分
在△EDG和△FDC中, ∠EG
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103092822-33278.gif)
∴△EDG≌△FDC ∴EG="CF " ……………………………8分
所以, BE="=CF. " ……………………………9分 (其它证法参考以上给分)
解析
核心考点
试题【(9分)已知,如图,EG∥AF.请你从①DE =" DF" ;②AB =" AC " ③BE = CF中,选择两个作为已知条件,剩余一个作为结论,写出一个真命题】;主要考察你对相似图形性质等知识点的理解。[详细]
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103092814-78913.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103092815-99990.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103092815-91040.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103092815-31996.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103092815-65373.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103092808-71422.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103092808-66272.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103092808-91476.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103092808-75200.png)
果
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103092808-71422.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103092808-30949.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103092808-22304.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103092809-19121.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103092809-14677.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103092809-51876.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103092802-75846.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103092803-36016.png)
还需添加一个条件,这个条件可以是 .(只需写出一个)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103092803-76143.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103092803-61173.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103092752-55803.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103092753-37381.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103092753-70495.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103092753-16443.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103092753-34137.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103092754-16692.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103092754-19061.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103092754-64008.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103092755-28207.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103092755-49500.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103092755-94699.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103092755-94699.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103092755-50848.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103092746-62588.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103092746-96032.jpg)
最新试题
- 1从战胜玉树地震、舟曲特大山洪泥石流灾害,到举办上海世博会;从实施应对国际金融危机冲击一揽子计划,到推进经济发展方式转变和
- 2已知:三点A( -2 ,-1) 、B(4 ,-1) 、C(2 ,3) .在坐标平面内画出以这三个点为顶点的平行四边形,并
- 3You won"t pass the exam _____ you study hard. [ ]A. if B
- 4反应2A(g)2B(g)+C(g) △H>0,要使逆反应速率增大,A的浓度减小(只改变一个条件),应采取的措施是
- 5实验室制取气体所需装置如图所示:请回答下列问题:(1)装置中标“a”的仪器名称是
- 6下图是2008年9月27日,“神舟七号”载人飞船航天员翟志刚迈出中国太空第一步。最早将人们的出行方式由陆地、水中转为空中
- 7The workers will continue striking unless the demands they__
- 8He _____ to go to the office by the English teacher yesterda
- 9在边长为1的8×8的正方形网格纸中,分别按要求画梯形(只要画一个),使它的四个顶点都在方格点上:(1)在图1中画一个梯形
- 10某质点在东西方向上做直线运动,其位移图像如图所示(规定向东的方向为正方向),试根据图像。(1)描述质点运动情况; (2)
热门考点
- 1关于如图所示的闸刀开关说法不正确的是( )A.瓷柄是绝缘体B.胶盖是绝缘体C.动触头是绝缘体D.静触头是导体
- 2“有物混成,先天地生,寂兮寥兮,独立而不改,周行而不怠,可以为天下母,吾不知其名,字之曰道。”——《老子》第二十五章。下
- 3室内温度是20°C,室外温度是-1°C,室内温度比室外温度高( )A. 19°CB. -19°CC. 21°CD
- 4如图,⊙O是△ABC的内切圆,与边BC,CA,AB 的切点分别为D,E,F,若∠A=70°,则∠EDF=( )。
- 5如图为草原生态系统的食物网简图,请据图回答下列问题.①图中所示若为完整的草原生态系统,则还缺少______部分和____
- 6Assume that the reciprocal of m+2 is 1m+2,them the value of
- 7腐烂的水果会散发出酒味,其原因是( )A.酵母菌引起的B.乳酸菌引起的C.霉菌引起的D.醋酸杆菌引起的
- 8________ follow the buffalo, the Indians often had to move t
- 9读“我国某地区7月平均气温图”回答(14分)(1)A、B两地所处的地形区分别是__ _ __、____
- 10冬天的清晨,我们经常看到玻璃窗上有美丽的“冰花”,这是______(选填“室内”或“室外”)空气中的水蒸气遇冷_____