题目
题型:单选题难度:简单来源:不详
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819181453-58742.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819181454-74367.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819181454-81657.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819181454-46537.png)
A.恒为负值 | B.等于![]() | C.恒为正值 | D.不大于![]() |
答案
解析
试题分析:∵
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819181454-74367.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819181454-26741.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819181454-26741.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819181454-81657.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819181455-14926.png)
点评:比较函数值的大小或判断函数值的符合问题,常常用导数法研究其单调性,再利用单调性解决
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819181448-53272.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819181449-51756.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819181449-61561.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819181449-25018.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819181449-42586.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819181450-67756.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819181450-74640.png)
A.2 | B.3 | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819181445-98167.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819181445-16539.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819181445-79718.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819181445-98167.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819181445-19948.png)
A.![]() | B.![]() |
C.![]() ![]() | D.随a的值而变化 |
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819181436-47499.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819181436-71153.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819181436-31524.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819181437-39569.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819181437-89724.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819181437-98211.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819181437-71392.png)
(1)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819181437-98211.png)
(2)当
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819181437-69739.png)
(3)设
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819181437-22986.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819181438-32803.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819181438-33603.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819181438-33603.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819181438-59172.png)
已知函数
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819181431-46274.png)
(1)判断函数
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819181431-99067.png)
(2)利用题(1)的结论,,求使不等式
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819181431-25444.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819181431-46812.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819181432-72970.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819181423-14680.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819181423-76680.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819181423-65457.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819181423-44518.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819181423-89143.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819181424-85212.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819181423-65457.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819181424-85212.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819181424-38969.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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