题目
题型:不详难度:来源:
已知a、b、c是△ABC三边长,关于x的方程
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070745-73560.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070745-93376.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070745-88548.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070746-28575.gif)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070746-29578.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070746-10112.gif)
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070746-71103.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070746-39451.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070747-80776.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070747-20613.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070747-22183.gif)
又
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070747-46517.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070748-35120.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070748-82363.gif)
(II)由
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070748-33734.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070748-86750.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070748-90278.gif)
即
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070749-20332.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070749-26778.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070749-90281.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070746-10112.gif)
核心考点
举一反三
![](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)
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)
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