题目
题型:解答题难度:一般来源:不详
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818050002-85306.png)
(1)试证明
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818050002-99411.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818050002-48182.png)
(2)当
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818050003-15063.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818050002-99411.png)
答案
(2)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818050002-99411.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818050003-57498.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818050003-57602.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818050002-99411.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818050003-80152.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818050003-48902.png)
解析
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818050002-48182.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818050004-48363.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818050004-66775.png)
第二步作差比较
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818050004-47439.png)
(2)在(1)的基础上可知
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818050002-99411.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818050003-15063.png)
(1)证明:在
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818050002-48182.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818050004-48363.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818050004-66775.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818050004-98142.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818050004-28757.png)
∵
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818050005-72216.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818050005-78571.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818050005-60776.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818050005-13646.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818050005-37549.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818050002-99411.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818050002-48182.png)
(2)∵
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818050002-99411.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818050002-48182.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818050002-99411.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818050003-57498.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818050003-57602.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818050002-99411.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818050003-80152.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818050003-48902.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818050000-56265.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818050000-81368.png)
求a的取值范围.
用定义法证明:函数
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818045958-99325.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818045955-63138.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818045955-53521.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818045956-82376.png)
A.![]() | B.![]() | C.![]() | D.![]() |
判断并证明函数
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818045953-28559.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818045953-80644.png)
已知
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818045949-49784.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818045949-73906.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818045949-28538.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818045949-49825.png)
(1)求当
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818045950-99935.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818045950-92663.png)
(2)作出函数
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818045950-92663.png)
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