题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20200206/20200206061536-68650.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200206/20200206061536-55766.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200206/20200206061536-19891.png)
A.[2,+∞) | B.(1,2] | C.(1,2) | D.(0,1) |
答案
解析
试题分析:
![](http://img.shitiku.com.cn/uploads/allimg/20200206/20200206061536-68650.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200206/20200206061536-55766.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200206/20200206061536-73694.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200206/20200206061537-69869.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200206/20200206061537-18861.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200206/20200206061537-22850.jpg)
![](http://img.shitiku.com.cn/uploads/allimg/20200206/20200206061537-18861.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200206/20200206061537-49585.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200206/20200206061537-45418.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200206/20200206061536-19891.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200206/20200206061538-31742.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200206/20200206061538-75165.png)
点评:将不等式恒成立问题转化为函数问题,本题结合函数图象求得
![](http://img.shitiku.com.cn/uploads/allimg/20200206/20200206061536-19891.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200206/20200206061536-19891.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20200206/20200206061517-87229.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200206/20200206061518-17257.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200206/20200206061518-49602.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200206/20200206061508-71901.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200206/20200206061509-11896.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200206/20200206061509-68846.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200206/20200206061509-20114.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20200206/20200206061501-59304.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200206/20200206061501-14008.png)
A.(1, 2) | B.(2,+¥) | C.(1,![]() | D.(![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20200206/20200206061456-41521.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200206/20200206061456-28915.png)
A.2 | B.3 | C.4 | D.2或3或4 |
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