题目
题型:解答题难度:简单来源:不详
已知函数
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820071943-41920.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820071943-30712.gif)
(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820071943-41255.gif)
(2)判定
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820071943-84302.gif)
(3)判断
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820071943-84302.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820071943-29769.gif)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820071944-59338.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820071944-87448.gif)
解析
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820071943-30712.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820071944-50867.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820071944-31718.gif)
(2)因为
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820071944-59338.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820071944-89185.gif)
又
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820071944-38740.gif)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820071944-59338.gif)
(3)设
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820071945-26062.gif)
则
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820071945-15411.gif)
因为
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820071945-26062.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820071945-83969.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820071945-89101.gif)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820071944-59338.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820071944-87448.gif)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820071931-20638.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820071931-65502.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820071931-60643.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820071932-90128.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820071932-50820.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820071932-20062.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820071932-41488.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820071932-31468.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820071933-53780.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820071933-83265.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820071933-93368.gif)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820071926-29196.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820071926-89769.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820071926-71793.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820071927-22488.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820071927-20778.gif)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820071925-94809.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820071922-14241.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820071922-87520.gif)
(Ⅱ)判断
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820071922-87520.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820071922-87520.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820071919-27599.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820071919-34775.gif)
A.5 | B.4 | C.3 | D.2 |
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