题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070739-97114.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070739-35090.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070739-93207.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070739-22497.gif)
(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070740-24601.gif)
(2)若
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070740-73572.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070740-47861.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070739-97114.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070740-84326.gif)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070740-16465.gif)
(2)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070741-45451.gif)
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070739-35090.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070741-44464.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070741-77770.gif)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070741-47927.gif)
(2)由
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070740-73572.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070742-77621.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070742-68963.gif)
则
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070742-29977.gif)
由正弦定理,得
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070742-38335.gif)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070739-97114.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070741-45451.gif)
核心考点
举一反三
已知向量
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070727-40768.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070727-16958.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070727-47064.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070727-99029.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070727-50134.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070727-78697.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070727-39249.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070727-78519.gif)
(Ⅰ)求
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070728-75286.gif)
(Ⅱ)设
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070728-87450.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070728-96696.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070728-63616.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070728-31499.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070729-88228.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070729-62101.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070728-87450.gif)
(本小题满分10分)
在△ABC中,a,b,c分别为角A,B,C所对的边a,b,c成等差数列,且a=2c
(I)求
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070720-25467.gif)
(II)若
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070720-41307.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070710-93934.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070710-53325.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070710-76684.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070704-68911.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070704-93747.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070704-43746.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070704-66608.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070705-89115.gif)
(2)若
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070705-37904.gif)
凸四边形ABCD中,
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070700-88873.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070700-11256.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070701-34928.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070701-40362.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070701-82865.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070701-86604.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070701-89256.gif)
A.45° B.75° C.105°
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070702-69279.gif)
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