【题文】函数,当定义域为,值域为,则的值为 ▲ .
【题文】函数,当定义域为,值域为,则的值为 ▲ .
题型:难度:来源:
【题文】函数
![](http://img.shitiku.com.cn/uploads/allimg/20200324/20200324235706-29542.png)
,当定义域为
![](http://img.shitiku.com.cn/uploads/allimg/20200324/20200324235706-72117.png)
,值域为
![](http://img.shitiku.com.cn/uploads/allimg/20200324/20200324235707-82528.png)
,则
![](http://img.shitiku.com.cn/uploads/allimg/20200324/20200324235707-38200.png)
的值为
▲ .
答案
【答案】
![](http://img.shitiku.com.cn/uploads/allimg/20200324/20200324235707-77112.png)
解析
【解析】设
![](http://img.shitiku.com.cn/uploads/allimg/20200324/20200324235708-63745.png)
;
![](http://img.shitiku.com.cn/uploads/allimg/20200324/20200324235708-10675.png)
,在
![](http://img.shitiku.com.cn/uploads/allimg/20200324/20200324235708-15039.png)
上递减,在[2,5]上递增;
![](http://img.shitiku.com.cn/uploads/allimg/20200324/20200324235708-93544.png)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20200324/20200324235709-84220.png)
若
![](http://img.shitiku.com.cn/uploads/allimg/20200324/20200324235709-27596.png)
,则函数
![](http://img.shitiku.com.cn/uploads/allimg/20200324/20200324235706-29542.png)
在
![](http://img.shitiku.com.cn/uploads/allimg/20200324/20200324235706-72117.png)
值域是
![](http://img.shitiku.com.cn/uploads/allimg/20200324/20200324235709-74960.png)
不符合题意;必有
![](http://img.shitiku.com.cn/uploads/allimg/20200324/20200324235709-73742.png)
此时值域为
![](http://img.shitiku.com.cn/uploads/allimg/20200324/20200324235710-19664.png)
举一反三
【题文】函数
![](http://img.shitiku.com.cn/uploads/allimg/20200324/20200324235700-65333.png)
的定义域是( )
【题文】已知函数
![](http://img.shitiku.com.cn/uploads/allimg/20200324/20200324235646-12891.png)
是定义在R上的奇函数,
![](http://img.shitiku.com.cn/uploads/allimg/20200324/20200324235646-16716.png)
,当
![](http://img.shitiku.com.cn/uploads/allimg/20200324/20200324235647-87396.png)
时,
![](http://img.shitiku.com.cn/uploads/allimg/20200324/20200324235647-90215.png)
,则不等式
![](http://img.shitiku.com.cn/uploads/allimg/20200324/20200324235647-40906.png)
的解集是______________
【题文】设函数
![](http://img.shitiku.com.cn/uploads/allimg/20200324/20200324235611-54109.png)
则
![](http://img.shitiku.com.cn/uploads/allimg/20200324/20200324235611-61722.png)
( )
【题文】函数
![](http://img.shitiku.com.cn/uploads/allimg/20200324/20200324235606-83136.png)
的定义域为
【题文】函数
![](http://img.shitiku.com.cn/uploads/allimg/20200324/20200324235557-36427.png)
的定义域为 ( )
最新试题
热门考点