题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204190313-92035.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204190313-63764.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204190314-51572.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204190314-53143.png)
答案
解析
试题分析:y轴左侧,函数的图象上升,说明函数为增函数,导数应为正数,排除C,D;y轴右侧,函数图象先降后升,说明函数先减后增,导数值应是先负后正,故选A。
点评:简单题,在某区间,导数值非负,函数为增函数,导数值非正,函数为减函数。
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204190257-70533.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204190257-34391.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204190230-25001.png)
(1)若
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204190230-56254.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204190230-68162.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204190230-43651.png)
(2)若
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204190230-68162.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204190231-51200.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204190217-50786.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204190217-54274.png)
(1)若函数满足
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204190217-61938.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204190218-33941.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204190218-21378.png)
(2)若函数
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204190218-25978.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204190219-72509.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204190201-43922.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204190201-50918.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204190201-24908.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204190202-59330.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204190126-69331.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204190126-94104.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204190126-21641.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204190126-11160.png)
(1) 求
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204190126-11160.png)
(2) 当
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204190127-95119.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204190127-12162.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204190127-31619.png)
(3) 若存在属于区间
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204190127-18127.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204190128-52088.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204190128-34441.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204190128-47306.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204190128-85718.png)
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