题目
题型:解答题难度:简单来源:不详
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818064011-66404.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818064012-19261.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818064012-56685.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818064012-64490.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818064012-46156.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818064012-50698.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818064013-43191.gif)
(1)判断函数
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818064011-66404.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818064012-19261.gif)
(2)若
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818064013-12875.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818064013-99289.gif)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818064011-66404.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818064012-19261.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818064013-32067.gif)
解析
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818064013-16106.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818064014-11992.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818064014-29878.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818064012-50698.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818064013-43191.gif)
故
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818064014-51569.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818064014-11115.gif)
因此
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818064011-66404.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818064012-19261.gif)
(2)由于
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818064014-84672.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818064012-56685.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818064012-64490.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818064015-47590.gif)
又
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818064015-70611.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818064015-80295.gif)
不等式又可化为
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818064015-12570.gif)
∵
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818064011-66404.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818064012-19261.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818064015-37528.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818064013-32067.gif)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818064005-94206.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818064005-44636.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818064006-65625.gif)
(1)求函数
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818064006-18383.gif)
(2)当
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818064006-95440.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818064006-18383.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818064003-48562.gif)
(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818064003-11001.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818064003-86001.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818064003-86001.gif)
(2)用函数单调性定义证明
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818064003-86001.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818064003-58884.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818063957-95373.gif)
(1)求函数
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818063958-95782.gif)
(2)讨论函数
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818063958-95782.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818063951-88185.gif)
(1)若
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818063951-65525.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818063951-36777.gif)
(2)若
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818063951-85772.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818063951-36777.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818063952-13366.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818063952-48418.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818063952-48418.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818063946-96981.gif)
(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818063946-32846.gif)
(2)当
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818063946-98832.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818063946-32846.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818063947-95155.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818063947-14987.gif)
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