【题文】已知函数,那么 ;若,则的取值范围是
【题文】已知函数,那么 ;若,则的取值范围是
题型:难度:来源:
答案
【答案】
![](http://img.shitiku.com.cn/uploads/allimg/20200331/20200331103625-40846.png)
;
![](http://img.shitiku.com.cn/uploads/allimg/20200331/20200331103625-48973.png)
解析
【解析】
试题分析:因为
![](http://img.shitiku.com.cn/uploads/allimg/20200331/20200331103626-51797.png)
,所以
![](http://img.shitiku.com.cn/uploads/allimg/20200331/20200331103626-42229.png)
,经分析
![](http://img.shitiku.com.cn/uploads/allimg/20200331/20200331103624-73335.png)
对应于
![](http://img.shitiku.com.cn/uploads/allimg/20200331/20200331103626-78613.png)
.
考点:1.分段函数;2.对数不等式.
举一反三
【题文】设
![](http://img.shitiku.com.cn/uploads/allimg/20200331/20200331103529-24977.png)
,则( )
【题文】设
![](http://img.shitiku.com.cn/uploads/allimg/20200331/20200331102808-99853.png)
,则( )
【题文】设函数
![](http://img.shitiku.com.cn/uploads/allimg/20200331/20200331102725-79942.png)
的定义域为
![](http://img.shitiku.com.cn/uploads/allimg/20200331/20200331102725-89111.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200331/20200331102725-92534.png)
,值域为
![](http://img.shitiku.com.cn/uploads/allimg/20200331/20200331102726-16025.png)
,若
![](http://img.shitiku.com.cn/uploads/allimg/20200331/20200331102726-51655.png)
的最小值为
![](http://img.shitiku.com.cn/uploads/allimg/20200331/20200331102726-32777.png)
,则实数a的值为 ( )
【题文】设函数
![](http://img.shitiku.com.cn/uploads/allimg/20200331/20200331102521-57582.png)
的定义域为
![](http://img.shitiku.com.cn/uploads/allimg/20200331/20200331102521-69266.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200331/20200331102522-29814.png)
,值域为
![](http://img.shitiku.com.cn/uploads/allimg/20200331/20200331102522-23759.png)
,若
![](http://img.shitiku.com.cn/uploads/allimg/20200331/20200331102522-43028.png)
的最小值为
![](http://img.shitiku.com.cn/uploads/allimg/20200331/20200331102522-17135.png)
,则实数a的值为 ( )
【题文】已知
![](http://img.shitiku.com.cn/uploads/allimg/20200331/20200331102235-14962.png)
,定义
![](http://img.shitiku.com.cn/uploads/allimg/20200331/20200331102235-10413.png)
表示不超过
![](http://img.shitiku.com.cn/uploads/allimg/20200331/20200331102236-62525.png)
的最大整数,则函数
![](http://img.shitiku.com.cn/uploads/allimg/20200331/20200331102236-13229.png)
的值域是
.
最新试题
热门考点