题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204174920-68536.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204174920-55119.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204174920-77575.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204174920-50643.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204174920-16194.png)
(1)写出函数
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204174920-86347.png)
(2)当
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204174921-42678.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204174921-21349.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204174921-60409.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204174921-74700.png)
(2)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204174921-17666.png)
解析
试题分析:解:(1)根据题意,由于函数
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204174920-68536.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204174920-55119.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204174920-77575.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204174920-50643.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204174920-16194.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204174920-68536.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204174921-74700.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204174921-39290.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204174921-80666.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204174922-47816.png)
令
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204174922-73756.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204174922-64880.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204174922-40491.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204174922-59764.png)
点评:主要是考查了函数解析式的求解,以及不等式的恒成立问题的运用,属于中档题。
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204174910-52155.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204174911-22882.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204174911-15300.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204174911-30933.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204174912-86880.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204174912-17123.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204174912-28929.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204174912-83554.png)
A.![]() | B.2 | C.![]() | D.2或![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204174819-83187.png)
A.3 | B.1 | C.-1 | D.-3 |
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204174808-99430.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204174751-95311.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204174751-30732.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204174751-85987.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204174752-26041.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204174752-60357.png)
(1)求实数
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204174752-45588.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204174751-95311.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204174751-30732.png)
(2)求证:函数
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204174752-42186.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204174753-94204.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204174730-89557.png)
A.![]() | B.![]() |
C.![]() | D.不存在这样的实数k |
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