【题文】下列四组函数中,相等的两个函数是( ) A.B.C.D.
【题文】下列四组函数中,相等的两个函数是( ) A.B.C.D.
题型:难度:来源:
答案
【答案】B
解析
【解析】
![](http://img.shitiku.com.cn/uploads/allimg/20200324/20200324185154-86309.png)
的定义域为R,
![](http://img.shitiku.com.cn/uploads/allimg/20200324/20200324185154-26089.png)
的定义域为
![](http://img.shitiku.com.cn/uploads/allimg/20200324/20200324185154-30981.png)
,所以两个函数不相等;
![](http://img.shitiku.com.cn/uploads/allimg/20200324/20200324185155-32828.png)
,则与
![](http://img.shitiku.com.cn/uploads/allimg/20200324/20200324185155-46755.png)
相等;
![](http://img.shitiku.com.cn/uploads/allimg/20200324/20200324185155-54210.png)
的定义域为
![](http://img.shitiku.com.cn/uploads/allimg/20200324/20200324185155-77205.png)
,
![](http://img.shitiku.com.cn/uploads/allimg/20200324/20200324185156-82617.png)
的定义域为R,所以两个函数不相等;
![](http://img.shitiku.com.cn/uploads/allimg/20200324/20200324185156-35829.png)
与
![](http://img.shitiku.com.cn/uploads/allimg/20200324/20200324185156-82617.png)
不相等,故选B
举一反三
【题文】函数f(x)=
![](http://img.shitiku.com.cn/uploads/allimg/20200324/20200324185148-66185.png)
的定义域是
【题文】函数f(x)=2
![](http://img.shitiku.com.cn/uploads/allimg/20200324/20200324185139-21006.png)
,则f(
![](http://img.shitiku.com.cn/uploads/allimg/20200324/20200324185140-65557.png)
)=
【题文】已知函数
![](http://img.shitiku.com.cn/uploads/allimg/20200324/20200324185133-54462.png)
,则
![](http://img.shitiku.com.cn/uploads/allimg/20200324/20200324185134-95293.png)
的值为( )
【题文】
![](http://img.shitiku.com.cn/uploads/allimg/20200324/20200324185128-43803.png)
是
![](http://img.shitiku.com.cn/uploads/allimg/20200324/20200324185129-62692.png)
的导函数,
![](http://img.shitiku.com.cn/uploads/allimg/20200324/20200324185128-43803.png)
的图象如右图所示,则
![](http://img.shitiku.com.cn/uploads/allimg/20200324/20200324185129-62692.png)
的图象只可能是
![](http://img.shitiku.com.cn/uploads/allimg/20200324/20200324185129-72634.png)
A B C D
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