题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018033215-34620.png)
(Ⅰ)当
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018033215-84717.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018033215-49422.png)
(Ⅱ)若当
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018033215-81944.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018033216-90026.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018033216-88451.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018033215-49422.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018033216-60079.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018033216-65059.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018033216-40523.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018033217-78578.png)
解析
试题分析:本题主要考查导数的运算以及利用导数研究函数的单调性和最值以及恒成立问题,考查函数思想,分类讨论思想,考查综合分析和解决问题的能力.第一问,将
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018033215-84717.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018033217-32964.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018033217-81049.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018033215-49422.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018033217-55709.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018033217-80937.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018033218-78536.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018033216-88451.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018033218-78536.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018033216-88451.png)
试题解析:(1)当
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018033215-84717.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018033218-77330.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018033218-71899.png)
令
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018033218-96447.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018033219-57826.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018033219-27145.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018033219-56453.png)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018033215-49422.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018033216-60079.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018033216-65059.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018033216-40523.png)
(2)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018033219-14788.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018033220-78571.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018033220-20133.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018033220-35539.png)
当
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018033220-31099.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018033220-91902.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018033218-78536.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018033221-43794.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018033220-35539.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018033217-55709.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018033215-49422.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018033221-96094.png)
当
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018033221-47264.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018033221-74477.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018033221-30715.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018033222-31981.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018033222-23900.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018033218-78536.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018033222-12659.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018033220-35539.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018033222-31981.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018033222-22008.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018033223-12351.png)
综上,
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018033216-88451.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018033217-78578.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018033205-78333.png)
(1)设函数
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018033205-45430.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018033205-39907.png)
(2)证明:
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018033206-24961.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018033206-16415.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018033149-66865.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018033150-51021.png)
(1)求函数
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018033150-56476.png)
(2)求函数
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018033150-56476.png)
(3)设函数
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018033150-80093.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018033150-89920.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018033151-80098.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018033151-12817.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018033151-74713.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018033124-90402.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018033124-45758.png)
(1)当
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018033124-60264.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018033125-76221.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018033125-58055.png)
(2)设函数
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018033125-87788.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018033125-69092.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018033125-18650.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018033126-33327.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018033126-46946.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018033126-42399.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018033126-59589.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018033103-53039.png)
(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018033103-40855.png)
(2)设函数
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018033103-16120.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018033103-49278.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018033104-50849.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018033104-72266.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018033053-33615.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018033054-18901.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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