题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191005/20191005045548-15388.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191005/20191005045548-18595.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191005/20191005045548-37133.gif)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191005/20191005045548-37133.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191005/20191005045548-18595.gif)
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191005/20191005045549-17416.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191005/20191005045549-64772.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191005/20191005045549-13247.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191005/20191005045549-15885.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191005/20191005045550-77279.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191005/20191005045548-18595.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191005/20191005045548-37133.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191005/20191005045549-15885.gif)
如图,由平面几何知识,易知
![](http://img.shitiku.com.cn/uploads/allimg/20191005/20191005045548-37133.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191005/20191005045548-18595.gif)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191005/20191005045208-27390.gif)
(1)若
![](http://img.shitiku.com.cn/uploads/allimg/20191005/20191005045209-13973.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191005/20191005045209-48750.gif)
(2)若
![](http://img.shitiku.com.cn/uploads/allimg/20191005/20191005045209-57707.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191005/20191005045209-67471.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191005/20191005045209-87086.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191005/20191005045110-95742.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191005/20191005045110-16983.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191005/20191005045110-43097.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191005/20191005045111-39011.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191005/20191005045111-23926.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191005/20191005045101-67967.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191005/20191005045101-71646.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191005/20191005045101-47157.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191005/20191005045102-29852.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191005/20191005045044-91825.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191005/20191005045044-90616.gif)
(1)若方程有实数根,求锐角
![](http://img.shitiku.com.cn/uploads/allimg/20191005/20191005045044-12284.gif)
(2)证明:对任意
![](http://img.shitiku.com.cn/uploads/allimg/20191005/20191005045044-50583.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191005/20191005044801-86012.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191005/20191005044801-35575.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191005/20191005044801-26568.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191005/20191005044802-70110.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191005/20191005044802-63083.gif)
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