题目
题型:解答题难度:简单来源:不详
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819063707-20657.gif)
(1)若
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819063707-55323.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819063707-96989.gif)
(2)若函数
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819063707-96989.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819063707-11579.gif)
(3)若
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819063708-94356.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819063708-70092.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819063708-99446.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819063708-15344.gif)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819063709-52326.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819063709-67622.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819063709-74662.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819063709-60234.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819063709-44345.gif)
故函数
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819063707-96989.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819063710-19047.gif)
(2)∵
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819063710-34487.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819063707-96989.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819063710-51011.gif)
若
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819063710-83929.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819063710-26543.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819063711-73530.gif)
即
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819063711-98774.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819063711-65810.gif)
若
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819063711-27099.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819063711-88266.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819063712-98892.gif)
因
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819063712-75950.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819063711-73530.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819063712-33489.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819063707-11579.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819063712-83912.gif)
综上所知,实数b的取值范围是
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819063712-94192.gif)
(3)当
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819063708-94356.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819063712-71709.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819063713-54565.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819063713-53487.gif)
则
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819063713-82366.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819063712-33489.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819063713-99888.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819063713-50476.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819063712-33489.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819063714-83946.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819063714-94244.gif)
又
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819063714-20569.gif)
故
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819063714-83392.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819063714-99589.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819063715-62895.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819063715-51015.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819063708-15344.gif)
解析
核心考点
试题【设函数.(1)若,求函数的单调区间;(2)若函数在定义域上是单调函数,求的取值范围;(3)若,证明对任意,不等式…都成立。】;主要考察你对一次函数的图象和性质等知识点的理解。[详细]
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819063704-93568.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819063704-33577.png)
A.![]() | B.![]() | C.![]() | D.1 |
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819063700-15721.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819063701-16903.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819063701-16903.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819063701-52316.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819063655-15698.gif)
(1)求函数
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819063655-49130.gif)
(2)在坐标系中画出函数
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819063655-49130.gif)
(3)讨论方程
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819063655-89171.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819063655-71778.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819063651-54430.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819063651-11262.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819063652-83825.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819063645-39344.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819063645-83581.gif)
(1)若
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819063646-93869.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819063646-34762.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819063646-88147.gif)
(2)当
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819063646-77024.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819063646-71141.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819063647-55775.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819063647-50319.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819063647-46446.gif)
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