题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017134112-24306.png)
(Ⅰ)求
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017134112-23564.png)
(Ⅱ) 若存在实数
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017134112-21476.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017134112-35278.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017134112-83168.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017134112-23564.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017134112-41963.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017134112-16600.png)
(Ⅱ) (
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017134113-13514.png)
解析
试题分析:(Ⅰ)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017134113-60512.png)
(ⅰ)当
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017134113-82547.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017134113-73455.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017134114-75808.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017134112-23564.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017134114-30232.png)
(ⅱ) 当
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017134114-20191.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017134114-12477.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017134115-31012.png)
当
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017134115-78357.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017134115-65970.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017134115-27817.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017134116-16974.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017134116-41912.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017134112-41963.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017134112-23564.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017134112-16600.png)
(Ⅱ)由
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017134112-35278.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017134114-75808.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017134116-20026.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017134116-14123.png)
由
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017134117-61760.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017134117-84210.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017134117-51238.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017134114-75808.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017134117-84581.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017134117-61760.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017134112-35278.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017134118-28342.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017134118-34516.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017134118-82247.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017134118-67440.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017134119-48822.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017134114-75808.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017134119-95811.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017134119-78916.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017134119-74101.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017134119-78980.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017134114-75808.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017134120-20880.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017134120-80702.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017134120-82494.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017134120-71392.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017134121-63249.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017134113-13514.png)
点评:难题,不等式恒成立问题,常常转化成求函数的最值问题。(II)小题,通过构造函数,研究函数的单调性、极值(最值),进一步确定得到参数的范围。
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017134106-78881.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017134106-63597.png)
A.3 | B.2 | C.1 | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017134102-76288.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017134102-28962.png)
A.f(0)+f(2)<2f(1) | B.f(0)+f(2)³2f(1) |
C.f(0)+f(2)>2f(1) | D.f(0)+f(2)³2f(1) |
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017134055-20157.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017134055-30234.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017134055-72318.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017134056-65196.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017134055-72318.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017134048-36147.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017134048-30175.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017134049-26018.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017134049-27437.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017134049-48843.jpg)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017134042-80434.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017134043-14635.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017134043-47416.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017134043-97782.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017134044-75568.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017134044-33721.png)
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