题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020051240-46868.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020051240-78967.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020051240-73844.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020051240-16900.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020051241-71832.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020051241-70504.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020051241-97274.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020051241-21040.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020051241-15267.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020051242-76578.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020051242-77176.png)
(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020051240-78967.png)
(2)若
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020051242-88968.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020051242-75082.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020051240-46868.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020051242-77176.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020051243-50887.png)
即:
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020051243-89249.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020051243-96297.png)
因为
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020051243-71717.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020051243-17306.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020051244-59067.png)
(2)因为
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020051244-90947.png)
由余弦定理,得:
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020051244-13534.png)
整理得:
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020051244-26720.png)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020051245-34139.png)
解析
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020051234-90706.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020051234-49069.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020051234-83130.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020051235-74349.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020051235-86129.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020051235-69522.png)
(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020051235-10043.png)
(2)求
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020051236-27479.png)
(3)求
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020051234-90706.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020051230-50810.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020051230-79103.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020051230-74056.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020051225-96246.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020051225-15416.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020051225-50303.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020051226-12286.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020051226-83941.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020051225-96246.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020051226-47783.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020051226-72786.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020051226-42490.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020051215-76618.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020051215-45413.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020051216-89362.png)
④若
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020051216-82380.png)
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