题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019020320-32914.png)
(1)求函数
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019020320-79897.png)
(2)求函数
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019020320-79897.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019020320-92689.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019020321-15743.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019020321-22604.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019020321-26742.png)
(2)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019020320-92689.png)
解析
试题分析:解:(1)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019020321-58595.png)
由
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019020321-66100.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019020322-22191.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019020322-78167.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019020322-90737.png)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019020320-92689.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019020321-15743.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019020321-22604.png)
单调递减区间为
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019020321-26742.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019020320-32914.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019020322-84900.png)
由
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019020322-28626.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019020323-73885.png)
当
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019020323-40418.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019020323-42730.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019020323-25387.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019020321-66100.png)
所以,当
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019020324-44585.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019020320-92689.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019020324-85679.png)
又
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019020324-56942.png)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019020320-92689.png)
点评:主要是考查了运用导数研究函数单调性以及函数最值问题,属于中档题。
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019020316-83627.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019020316-84801.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019020303-42075.png)
(Ⅰ)求
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019020303-56086.png)
(Ⅱ)求
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019020303-56086.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019020304-28786.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019020253-18576.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019020253-66677.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019020254-19669.png)
(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019020254-89266.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019020254-67370.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019020254-64439.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019020254-71673.png)
(2)设
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019020255-78076.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019020255-60532.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019020255-95956.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019020247-44853.png)
A.![]() | B.![]() | C.![]() | D.![]() |
A.![]() | B.100 | C.20 | D.![]() |
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