题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020060806-51823.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020060806-25514.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020060806-44459.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020060806-25514.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020060806-78680.png)
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020060807-94855.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020060807-53763.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020060807-76067.png)
在三角形ABD中,由正弦定理
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020060807-96596.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020060808-80410.png)
同理在三角形ADC中
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020060808-29953.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020060808-21451.png)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020060808-83798.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020060800-61396.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020060800-53948.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020060801-78772.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020060801-39368.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020060801-92882.png)
A.75° | B.60° | C.45° | D.30° |
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020060755-31096.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020060755-83789.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020060755-77193.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020060755-59758.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020060755-58010.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020060756-39282.jpg)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020060750-26278.png)
A.150° | B.120° | C.60° | D.30° |
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020060748-60598.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020060743-36515.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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