题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103060252-50530.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103060252-90928.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103060252-12887.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103060252-39298.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103060253-48394.jpg)
答案
解析
在△ABC中,∠A=40°,∠C=∠ABC,
∴∠C=∠ABC=
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103060253-24148.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103060253-24148.png)
在△ABD中,由∠BDC=∠A+∠ABD得
∠ABD=∠BDC﹣∠A=70°﹣40°=30度.故选B.
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103060247-41606.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103060247-80264.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103060248-58529.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103060248-26395.jpg)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103060242-59901.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103060242-68976.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103060243-78520.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103060243-83155.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103060243-35552.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103060243-90724.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103060244-92657.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103060244-90802.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103060244-27037.jpg)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103060234-11359.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103060235-25158.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103060235-72760.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103060235-95493.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103060236-47682.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103060236-89914.png)
求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103060236-65625.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103060236-96797.jpg)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103060222-71098.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103060222-81533.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103060222-30206.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103060222-98355.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103060222-71098.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103060223-62813.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103060223-81323.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103060223-90100.png)
⑴探究线段
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103060223-62813.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103060223-10184.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103060224-54167.png)
⑵若将“
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103060222-30206.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103060224-97175.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103060224-92884.jpg)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103060219-57635.png)
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