题目
题型:解答题难度:一般来源:不详
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817172500-72846.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817172500-15901.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817172500-73578.png)
(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817172500-76339.png)
(2)判断
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817172500-76339.png)
(3)求
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817172500-76339.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817172501-81582.png)
(2)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817172500-76339.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817172501-73326.png)
解析
(1)因为函数
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817172500-72846.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817172500-15901.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817172500-73578.png)
可知
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817172501-91052.png)
(2)利用单调性的定义法,可以判定
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817172500-76339.png)
(3)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817172501-66405.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817172501-73326.png)
(1)∵
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817172502-82120.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817172501-91052.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817172502-82399.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817172502-64909.png)
故
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817172502-16794.png)
(2)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817172500-76339.png)
则
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817172503-35146.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817172503-47946.png)
∵
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817172503-46936.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817172503-84368.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817172503-20773.png)
故
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817172504-27705.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817172504-79869.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817172504-45824.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817172500-76339.png)
(3)∵
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817172501-66405.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817172501-73326.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817172458-21571.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817172451-12761.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817172451-17520.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817172451-17834.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817172447-74284.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817172442-93764.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817172437-53608.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817172437-27920.png)
(1)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817172438-92038.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817172438-48697.png)
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