题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020035413-71910.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020035413-53803.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020035413-60938.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020035413-39902.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020035414-76173.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020035414-23417.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020035414-43944.jpg)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020035414-64214.png)
解析
试题分析:由正弦定理得:
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020035414-32790.png)
即
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020035414-53415.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020035415-18967.png)
由余弦定理 得
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020035415-29948.png)
解得
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020035414-64214.png)
点评:解三角形时一般应用正弦定理:
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020035415-20743.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020035415-70976.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020035415-66994.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020035416-89989.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020035405-98465.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020035405-65891.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020035406-32269.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020035406-92568.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020035406-85052.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020035406-69110.png)
(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020035406-28354.png)
(2)若
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020035406-91069.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020035406-17359.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020035356-47545.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020035356-27851.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020035357-59934.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020035357-73638.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020035357-22126.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020035357-52116.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020035358-83695.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020035358-85517.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020035350-22884.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020035350-85954.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020035350-72059.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020035350-81654.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020035350-14355.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020035345-93881.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020035345-10565.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020035346-92445.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020035346-35394.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020035345-93881.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020035342-82957.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020035343-18066.png)
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