题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033425-22287.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033425-82970.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033425-32883.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033425-22287.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033425-11827.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033426-43367.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033426-72645.png)
解析
试题分析:由三角形面积公式,得:
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033426-44787.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033426-20795.png)
由余弦定理,得:
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033426-78012.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033427-77374.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033417-58401.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033418-28789.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033418-30975.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033409-70352.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033409-87339.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033409-37327.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033409-42566.png)
(Ⅰ)求
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033410-17553.png)
(Ⅱ)若
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033410-41534.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033409-70352.png)
(Ⅰ)求A;
(Ⅱ)若a=2
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033400-57616.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033400-75590.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033351-33479.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033351-73828.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033352-82183.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033352-71046.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033352-70567.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033352-68424.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033352-82598.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033353-59967.png)
(1)求角
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033351-73828.png)
(2)若
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033353-25911.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033351-33479.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033341-15186.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033342-29882.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033342-66632.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033342-30372.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033342-12642.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033341-15186.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033343-84679.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033342-30372.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033343-73206.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033343-23505.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033343-42315.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033343-53211.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033344-74062.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033344-36789.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033344-73154.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033344-14230.png)
(Ⅰ)求角
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033343-53211.png)
(Ⅱ)若
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033345-12082.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033345-76339.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033345-44856.png)
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