题目
题型:解答题难度:一般来源:不详
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819024704-46964.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819024704-15082.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819024704-53833.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819024704-54245.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819024705-97177.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819024705-43949.png)
(1)当
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819024704-54245.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819024705-56419.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819024704-15082.png)
(2)当x∈
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819024705-56419.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819024704-15082.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819024706-22812.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819024706-67195.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819024706-10220.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819024706-23954.png)
解析
试题分析:(1)由已知条件可求出f(x+4)=9f(x),设x∈[-4,-2],则4+x∈[0,2],由已知可得f(x+4)的解析式,即可得解.(2)首先求出
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819024706-10220.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819024705-56419.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819024706-53417.png)
试题解析:(1)由f(x+2)=3f(x),得f(x+4)=3f(x+2)=9f(x),
设x∈[-4,-2],则4+x∈[0,2],∴f(x+4)=(x+4)2-2(x+4)=x2+6x+8,
因为f(x+4)=9f(x)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819024706-10220.png)
(2)因为x∈
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819024705-56419.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819024704-15082.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819024706-22812.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819024705-56419.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819024706-83525.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819024705-56419.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819024707-32783.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819024707-35678.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819024707-17845.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819024706-23954.png)
核心考点
试题【(本小题满分12分)定义域为的函数满足,当∈时,(1)当∈时,求的解析式;(2)当x∈时,≥恒成立,求实数的取值范围.】;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/20190819/20190819024654-90936.png)
(1)若对任意
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819024655-24027.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819024655-54275.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819024655-61057.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819024655-12813.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819024655-64441.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819024656-58031.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819024656-96561.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819024656-17931.png)
(2)若关于
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819024655-64441.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819024656-17530.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819024656-17931.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819024656-96132.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819024657-12302.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819024657-17522.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819024657-97408.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819024657-78262.png)
⑴求f (x)的解析式;
⑵在区间[-1,1]上,y=f (x)的图象恒在y=2x+m的图象上方,试确定实数m的范围.
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819024642-40785.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819024643-23896.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819024643-73388.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819024643-70723.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819024640-83329.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819024640-48617.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819024640-49180.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819024640-39721.jpg)
A.![]() | B.![]() | C.1 | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819024631-47132.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819024631-69442.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819024631-76819.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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