题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020040841-80263.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020040841-70374.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020040842-16377.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020040842-95034.png)
(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020040842-11838.png)
(2)求
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020040841-80263.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020040842-85660.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020040843-10133.png)
解析
试题分析:根据题意,由于
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020040842-95034.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020040843-41907.png)
(2)根据三角形的面积公式可知,
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020040843-50364.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020040843-10133.png)
点评:本题主要考查了正弦定理的应用.在解三角形问题中常涉及正弦定理、余弦定理、三角形面积公式及同角三角函数基本关系等问题,故应综合把握
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020040834-13945.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020040834-20615.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020040834-92283.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020040835-12458.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020040835-52868.png)
已 知向量
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020040835-70715.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020040835-85902.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020040836-31254.png)
(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020040836-49886.png)
(2)若
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020040836-51288.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020040834-13945.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020040830-46869.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020040822-41077.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020040817-45053.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020040817-29257.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020040818-12537.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020040818-32677.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020040812-29926.png)
(1)求△ABC的面积
(2)求边c的长
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