题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020002211-59996.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020002211-10242.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020002211-96597.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020002212-36595.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020002212-31555.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020002212-24547.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020002212-29381.png)
A.![]() | B.![]() | C.![]() | D.3 |
答案
解析
试题分析:由余弦定理
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020002213-37949.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020002212-36595.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020002212-31555.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020002212-24547.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020002214-44551.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020002212-29381.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020002213-76847.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020002201-44561.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020002201-93322.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020002202-90937.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020002202-85964.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020002202-11301.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020002202-96366.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020002203-54605.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020002203-50833.png)
(1)求角
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020002201-93322.png)
(2)若
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020002203-45775.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020002203-14738.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020002202-96366.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020002203-54605.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020002152-98665.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020002152-56709.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020002152-19304.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020002152-67964.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020002153-65568.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020002153-26276.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020002153-99233.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020002153-81584.png)
(1)求角
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020002152-19304.png)
(2)若
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020002154-77907.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020002154-48158.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020002153-65568.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020002153-99233.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020002143-53689.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020002143-59437.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020002144-63962.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020002144-86129.png)
则
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020002144-21459.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020002139-33361.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020002139-51752.png)
A.
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020002139-23361.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020002139-50544.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020002140-59722.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020002140-87857.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020002135-13719.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020002136-26282.png)
A.30° | B.60°或120° | C.60° | D.120° |
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