题目
题型:解答题难度:一般来源:不详
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818063536-86231.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818063536-68200.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818063536-76467.gif)
(1)对于函数
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818063536-86231.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818063537-45698.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818063537-14244.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818063537-63010.gif)
(2)当
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818063537-15314.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818063537-57400.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818063538-16186.gif)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818063538-22597.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818063538-66640.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818063538-85461.gif)
解析
:
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818063538-38667.gif)
因为
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818063539-35579.gif)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818063536-86231.gif)
当
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818063539-41234.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818063539-11140.gif)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818063536-86231.gif)
当
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818063539-76420.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818063539-54379.gif)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818063536-86231.gif)
综上所述,
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818063540-29697.gif)
(1)由
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818063540-58885.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818063540-58285.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818063538-22597.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818063540-63559.gif)
(2)因为
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818063536-86231.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818063541-40430.gif)
由
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818063541-66868.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818063541-55644.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818063541-29032.gif)
要使
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818063541-40430.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818063541-13223.gif)
即
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818063542-51016.gif)
解得
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818063538-66640.gif)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818063538-16186.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818063538-66640.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818063538-85461.gif)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818063530-78121.gif)
(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818063531-12073.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818063531-12073.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818063531-22505.gif)
(3)若
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818063531-33537.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818063531-59164.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818063531-76835.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818063531-17611.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818063525-46057.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818063525-92930.gif)
(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818063525-19102.gif)
(2)求
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818063525-19102.gif)
(3)若方程
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818063525-89109.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818063517-75706.gif)
(Ⅰ)求
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818063517-65266.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818063517-16727.gif)
(Ⅱ)若
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818063518-43599.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818063518-78514.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818063518-26015.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818063514-57521.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818063514-47171.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818063510-92710.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818063511-65199.gif)
A.增函数,且![]() | B.减函数,且![]() |
C.增函数,且![]() | D.减函数,且![]() |
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