题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020064037-47444.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020064037-14919.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020064037-24621.gif)
(Ⅰ)求
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020064037-74923.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020064037-46744.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020064037-47444.gif)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020064037-31526.gif)
(Ⅱ)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020064037-47444.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020064037-86844.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020064038-61428.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020064038-99718.gif)
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020064037-14919.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020064038-81865.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020064037-24621.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020064038-69592.gif)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020064038-91795.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020064038-34222.gif)
(Ⅱ)由正弦定理得
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020064039-26762.gif)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020064037-47444.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020064037-86844.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020064038-61428.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020064038-99718.gif)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020064029-59224.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020064029-86463.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020064030-49479.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020064025-72603.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020064025-30535.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020064025-72603.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020064021-98259.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020064021-20592.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020064021-80284.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020064022-27815.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020064022-66229.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020064012-73582.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020064013-31881.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020064013-86444.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020064013-53835.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020064013-94809.gif)
(Ⅰ) 求sinA的值;
(Ⅱ)求
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020064013-35695.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020064003-94794.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020064003-87143.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020064003-84538.gif)
(1)求角B的大小;(2)若AC=
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020064003-74379.gif)
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