题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020050154-84112.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020050154-77491.png)
即
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020050154-63901.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020050154-33108.png)
解之:
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020050155-94082.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020050155-49189.png)
由余弦定理:
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020050155-49150.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020050155-20464.png)
解析
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020050149-45691.png)
A.![]() | B.![]() | C.![]() | D.1 |
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020050146-70380.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020050141-86965.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020050141-50163.png)
(1)求角
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020050142-80693.png)
(2)若
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020050141-86965.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020050142-60870.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020050142-19132.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020050134-28975.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020050134-67750.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020050135-34950.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020050135-36292.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020050135-21597.png)
(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020050135-16172.png)
(2)当
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020050136-90489.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020050136-87162.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020050134-28975.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020050134-28975.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020050125-37840.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020050126-90088.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020050126-89481.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020050126-25974.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020050126-93513.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020050127-96158.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020050127-92674.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020050127-91359.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020050127-86166.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020050127-99288.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020050128-88437.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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