题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204220510-97871.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204220511-73092.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204220511-62523.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204220511-60097.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204220511-90889.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204220512-45717.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204220511-62523.png)
答案
解析
试题分析:由题意对于任意实数x1,x2等式恒成立,故可采用赋值法求解.
(i)令
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204220512-71291.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204220511-62523.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204220511-62523.png)
(ii)令
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204220512-89913.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204220511-62523.png)
点评:本题考查抽象函数的求值问题,一般采用赋值法解决.综合性较强.
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204220458-93771.png)
若函数在区间(a,a+
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204220458-89847.png)
如果当
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204220459-68404.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204220459-91191.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204220459-13750.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204220331-93220.png)
(1)画出函数y=f(x)的图像;
(2)若不等式
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204220331-39292.png)
已知函数
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204220246-61497.png)
(Ⅰ)当
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204220247-39332.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204220247-88489.png)
(Ⅱ)当函数
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204220247-88489.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204220247-41868.png)
我们把定义在
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204220209-55358.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204220210-96718.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204220210-79099.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204220210-55076.png)
(1)若某个似周期函数
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204220210-15652.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204220211-98512.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204220211-90326.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204220211-37296.png)
(2)当
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204220211-71460.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204220212-57025.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204220212-62764.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204220210-15652.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204220212-34098.png)
(3)对于确定的
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204220212-96850.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204220213-34949.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204220210-15652.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204220214-12476.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204220215-82744.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204220204-18281.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204220204-21001.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204220204-63487.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204220204-66884.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204220205-10920.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204220205-29367.png)
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