【题文】已知函数是上的偶函数,若对于,都有且当时,,则的值为( )A. B. C.D.
【题文】已知函数是上的偶函数,若对于,都有且当时,,则的值为( )A. B. C.D.
题型:难度:来源:
【题文】已知函数
![](http://img.shitiku.com.cn/uploads/allimg/20200326/20200326221400-50837.png)
是
![](http://img.shitiku.com.cn/uploads/allimg/20200326/20200326221400-61134.png)
上的偶函数,若对于
![](http://img.shitiku.com.cn/uploads/allimg/20200326/20200326221401-30800.png)
,都有
![](http://img.shitiku.com.cn/uploads/allimg/20200326/20200326221401-58896.png)
且当
![](http://img.shitiku.com.cn/uploads/allimg/20200326/20200326221401-58064.png)
时,
![](http://img.shitiku.com.cn/uploads/allimg/20200326/20200326221401-72554.png)
,则
![](http://img.shitiku.com.cn/uploads/allimg/20200326/20200326221402-12896.png)
的值为( )
答案
【答案】C
解析
【解析】由
![](http://img.shitiku.com.cn/uploads/allimg/20200326/20200326221403-55176.png)
,故选C
举一反三
【题文】 已知函数
![](http://img.shitiku.com.cn/uploads/allimg/20200326/20200326221243-19745.png)
为偶函数,它在
![](http://img.shitiku.com.cn/uploads/allimg/20200326/20200326221244-75064.png)
上减函数,若
![](http://img.shitiku.com.cn/uploads/allimg/20200326/20200326221244-77959.png)
,则x的取值范围是( )
【题文】已知偶函数
![](http://img.shitiku.com.cn/uploads/allimg/20200326/20200326221208-79379.png)
满足条件:当
![](http://img.shitiku.com.cn/uploads/allimg/20200326/20200326221208-64596.png)
时,恒有
![](http://img.shitiku.com.cn/uploads/allimg/20200326/20200326221208-16096.png)
,且
![](http://img.shitiku.com.cn/uploads/allimg/20200326/20200326221209-81140.png)
时,有
![](http://img.shitiku.com.cn/uploads/allimg/20200326/20200326221209-25080.png)
,则
![](http://img.shitiku.com.cn/uploads/allimg/20200326/20200326221209-86767.png)
的大小关系是 ( )
![](http://img.shitiku.com.cn/uploads/allimg/20200326/20200326221210-32247.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200326/20200326221210-85748.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200326/20200326221211-13331.png)
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