题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070812-88289.gif)
(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070812-37721.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070812-92048.gif)
答案
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070812-26076.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070813-51579.gif)
解得
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070813-66649.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070813-27998.gif)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070813-53288.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070813-65782.gif)
(II)在
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070814-64192.gif)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070814-66419.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070814-38962.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070814-89625.gif)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070812-92048.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070815-31784.gif)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070802-97361.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070803-15143.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070803-70193.gif)
A.三边均不相等的三角形 | B.直角三角形 |
C.等腰非等边三角 | D.等边三角形 |
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070757-64906.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070757-17951.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070757-90020.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070757-37287.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070757-61161.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070757-64048.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070757-64022.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070757-48253.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020070758-83014.gif)
A.![]() | B.![]() | C.![]() | D.![]() |
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)
![](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)
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