题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020004452-52910.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020004453-72688.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020004453-60909.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020004453-78843.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020004454-15265.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020004454-96080.png)
A.![]() | B.![]() | C.![]() | D.![]() |
答案
解析
试题分析:由余弦定理知:
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020004455-40269.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020004456-14759.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020004456-34188.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020004456-96608.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020004447-70100.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020004447-54907.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020004447-94732.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020004448-13021.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020004448-45368.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020004448-38170.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020004448-57533.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020004441-74517.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020004441-36391.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020004441-93725.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020004441-58869.png)
(1)求角
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020004442-95137.png)
(2)若
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020004442-54065.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020004441-74517.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020004442-64881.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020004429-78999.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020004429-15335.png)
(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020004429-42411.png)
(2)已知在△ABC中,角A、B、C的对边分别为
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020004430-71130.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020004430-82947.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020004424-93786.png)
A.
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020004424-69323.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020004424-13629.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020004424-52741.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020004425-50918.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020004417-89743.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020004417-48479.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020004417-81356.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020004418-88381.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020004418-91524.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020004418-10020.png)
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