题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020054438-46726.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020054438-52747.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020054439-16723.png)
A.![]() | B.![]() | C.![]() | D.![]() |
答案
解析
由正弦定理
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020054440-98448.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020054440-86644.png)
又
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020054440-91623.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020054440-43197.png)
即
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020054440-87280.png)
则
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020054441-21459.png)
又由余弦定理得
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020054441-68375.png)
则有
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020054441-89050.png)
即
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020054441-89540.png)
因为
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020054441-67725.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020054442-61339.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020054442-34005.png)
故正确答案为B
核心考点
举一反三
(本题12分)
已知
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020054430-54596.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020054431-31074.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020054431-11173.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020054431-43475.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020054431-12721.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020054431-53322.gif)
(I)若
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020054431-71918.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020054432-43378.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020054430-54596.gif)
(Ⅱ) 若
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020054431-71918.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020054432-19455.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020054432-73881.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020054432-64896.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020054433-40956.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020054430-54596.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020054427-25872.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020054427-57823.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020054419-12868.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020054419-64354.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020054419-44925.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020054419-92175.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020054419-97987.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020054420-99833.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020054420-79431.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020054420-37397.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020054420-38330.gif)
(Ⅰ)当
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020054421-66687.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020054419-64354.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020054419-12868.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020054421-50803.gif)
(Ⅰ)求角B及边b的最大值;
(Ⅱ)设△ABC的面积为S,求S+
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020054414-68662.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020054406-47128.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020054407-20039.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020054407-46546.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020054407-60455.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020054407-60635.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020054406-47128.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020054407-81630.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020054407-75193.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020054408-72755.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020054408-35454.gif)
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