【题文】已知函数:①,②,③.则以下四个命题对以上的三个函数都成立的是( )命题:是奇函数;命题:在上是增函数;命题:;命题:
【题文】已知函数:①,②,③.则以下四个命题对以上的三个函数都成立的是( )命题:是奇函数;命题:在上是增函数;命题:;命题:
题型:难度:来源:
【题文】已知函数:①
![](http://img.shitiku.com.cn/uploads/allimg/20200327/20200327032047-29030.png)
,②
![](http://img.shitiku.com.cn/uploads/allimg/20200327/20200327032047-76638.png)
,③
![](http://img.shitiku.com.cn/uploads/allimg/20200327/20200327032047-13341.png)
.则以下四个命题对以上的三个函数都成立的是( )
命题
![](http://img.shitiku.com.cn/uploads/allimg/20200327/20200327032047-16272.png)
:
![](http://img.shitiku.com.cn/uploads/allimg/20200327/20200327032048-43610.png)
是奇函数;
命题
![](http://img.shitiku.com.cn/uploads/allimg/20200327/20200327032048-53638.png)
:
![](http://img.shitiku.com.cn/uploads/allimg/20200327/20200327032049-25897.png)
在
![](http://img.shitiku.com.cn/uploads/allimg/20200327/20200327032049-16706.png)
上是增函数;
命题
![](http://img.shitiku.com.cn/uploads/allimg/20200327/20200327032049-64055.png)
:
![](http://img.shitiku.com.cn/uploads/allimg/20200327/20200327032050-32719.png)
;
命题
![](http://img.shitiku.com.cn/uploads/allimg/20200327/20200327032050-37846.png)
:
![](http://img.shitiku.com.cn/uploads/allimg/20200327/20200327032050-92173.png)
的图像关于直线
![](http://img.shitiku.com.cn/uploads/allimg/20200327/20200327032051-19197.png)
对称
答案
【答案】C
解析
【解析】
试题分析:对应命题p:由①
![](http://img.shitiku.com.cn/uploads/allimg/20200327/20200327032052-76682.png)
,不符合;由②
![](http://img.shitiku.com.cn/uploads/allimg/20200327/20200327032053-41164.png)
,是奇函数;由③,
![](http://img.shitiku.com.cn/uploads/allimg/20200327/20200327032054-37743.png)
.命题
![](http://img.shitiku.com.cn/uploads/allimg/20200327/20200327032054-63068.png)
由①,
![](http://img.shitiku.com.cn/uploads/allimg/20200327/20200327032050-92173.png)
的开口向下,对称轴
![](http://img.shitiku.com.cn/uploads/allimg/20200327/20200327032051-19197.png)
,
![](http://img.shitiku.com.cn/uploads/allimg/20200327/20200327032054-20572.png)
是将
![](http://img.shitiku.com.cn/uploads/allimg/20200327/20200327032050-92173.png)
向左平移一个单位,则其对称轴为
![](http://img.shitiku.com.cn/uploads/allimg/20200327/20200327032055-13622.png)
,易知
![](http://img.shitiku.com.cn/uploads/allimg/20200327/20200327032054-20572.png)
在
![](http://img.shitiku.com.cn/uploads/allimg/20200327/20200327032055-58348.png)
上是增函数;由②,
![](http://img.shitiku.com.cn/uploads/allimg/20200327/20200327032055-65067.png)
,令
![](http://img.shitiku.com.cn/uploads/allimg/20200327/20200327032055-54355.png)
,当
![](http://img.shitiku.com.cn/uploads/allimg/20200327/20200327032056-59308.png)
时,
![](http://img.shitiku.com.cn/uploads/allimg/20200327/20200327032056-50744.png)
,易知
![](http://img.shitiku.com.cn/uploads/allimg/20200327/20200327032056-15674.png)
在
![](http://img.shitiku.com.cn/uploads/allimg/20200327/20200327032057-17071.png)
上单调递减,故
![](http://img.shitiku.com.cn/uploads/allimg/20200327/20200327032054-20572.png)
在
![](http://img.shitiku.com.cn/uploads/allimg/20200327/20200327032055-58348.png)
上是减函数,则②不符合;由③,
![](http://img.shitiku.com.cn/uploads/allimg/20200327/20200327032057-35058.png)
,当
![](http://img.shitiku.com.cn/uploads/allimg/20200327/20200327032056-59308.png)
,
![](http://img.shitiku.com.cn/uploads/allimg/20200327/20200327032057-35058.png)
单调递增.命题
![](http://img.shitiku.com.cn/uploads/allimg/20200327/20200327032057-34705.png)
由①,
![](http://img.shitiku.com.cn/uploads/allimg/20200327/20200327032058-83710.png)
,符合;由②,
![](http://img.shitiku.com.cn/uploads/allimg/20200327/20200327032058-38400.png)
,符合;由③,
![](http://img.shitiku.com.cn/uploads/allimg/20200327/20200327032058-40977.png)
,符合.命题
![](http://img.shitiku.com.cn/uploads/allimg/20200327/20200327032058-27321.png)
由①,关于
![](http://img.shitiku.com.cn/uploads/allimg/20200327/20200327032051-19197.png)
对称,符合;由②,
![](http://img.shitiku.com.cn/uploads/allimg/20200327/20200327032053-41164.png)
,其对称轴为
![](http://img.shitiku.com.cn/uploads/allimg/20200327/20200327032059-82039.png)
,即
![](http://img.shitiku.com.cn/uploads/allimg/20200327/20200327032059-56875.png)
,当
![](http://img.shitiku.com.cn/uploads/allimg/20200327/20200327032059-34027.png)
,一条对称轴为
![](http://img.shitiku.com.cn/uploads/allimg/20200327/20200327032051-19197.png)
,符合;由③,因为
![](http://img.shitiku.com.cn/uploads/allimg/20200327/20200327032100-46094.png)
,
![](http://img.shitiku.com.cn/uploads/allimg/20200327/20200327032101-79594.png)
,偶函数,关于
![](http://img.shitiku.com.cn/uploads/allimg/20200327/20200327032055-13622.png)
对称,
![](http://img.shitiku.com.cn/uploads/allimg/20200327/20200327032101-61873.png)
是由
![](http://img.shitiku.com.cn/uploads/allimg/20200327/20200327032100-46094.png)
右移1个单位,则其对称轴
![](http://img.shitiku.com.cn/uploads/allimg/20200327/20200327032051-19197.png)
,符合.所以命题
![](http://img.shitiku.com.cn/uploads/allimg/20200327/20200327032101-38267.png)
成立,故选C.
考点:1.函数的单调性、奇偶性、对称性.
举一反三
【题文】给出下列命题:
①已知集合M满足
![](http://img.shitiku.com.cn/uploads/allimg/20200327/20200327032035-49812.png)
,且M中至多有一个偶数,这样的集合M有6个;
②函数
![](http://img.shitiku.com.cn/uploads/allimg/20200327/20200327032036-38908.png)
,在区间
![](http://img.shitiku.com.cn/uploads/allimg/20200327/20200327032036-55593.png)
上为减函数,则
![](http://img.shitiku.com.cn/uploads/allimg/20200327/20200327032036-47441.png)
的取值范围为
![](http://img.shitiku.com.cn/uploads/allimg/20200327/20200327032037-90262.png)
;
③已知函数
![](http://img.shitiku.com.cn/uploads/allimg/20200327/20200327032037-55612.png)
,则
![](http://img.shitiku.com.cn/uploads/allimg/20200327/20200327032037-68092.png)
;
④如果函数
![](http://img.shitiku.com.cn/uploads/allimg/20200327/20200327032038-84650.png)
的图象关于y轴对称,且
![](http://img.shitiku.com.cn/uploads/allimg/20200327/20200327032039-54075.png)
,
则当
![](http://img.shitiku.com.cn/uploads/allimg/20200327/20200327032039-54349.png)
时,
![](http://img.shitiku.com.cn/uploads/allimg/20200327/20200327032039-51274.png)
;
其中正确的命题的序号是
。
【题文】已知
![](http://img.shitiku.com.cn/uploads/allimg/20200327/20200327032001-70254.png)
在
![](http://img.shitiku.com.cn/uploads/allimg/20200327/20200327032002-61645.png)
上是奇函数,且满足
![](http://img.shitiku.com.cn/uploads/allimg/20200327/20200327032002-74342.png)
,当
![](http://img.shitiku.com.cn/uploads/allimg/20200327/20200327032002-36379.png)
时,
![](http://img.shitiku.com.cn/uploads/allimg/20200327/20200327032002-81936.png)
,则
![](http://img.shitiku.com.cn/uploads/allimg/20200327/20200327032003-22119.png)
的值为 ( )
【题文】若函数
![](http://img.shitiku.com.cn/uploads/allimg/20200327/20200327031942-51245.png)
满足:存在非零常数
![](http://img.shitiku.com.cn/uploads/allimg/20200327/20200327031942-25286.png)
,对定义域内的任意实数
![](http://img.shitiku.com.cn/uploads/allimg/20200327/20200327031942-10651.png)
,有
![](http://img.shitiku.com.cn/uploads/allimg/20200327/20200327031943-81240.png)
成立,则称
![](http://img.shitiku.com.cn/uploads/allimg/20200327/20200327031942-51245.png)
为“
![](http://img.shitiku.com.cn/uploads/allimg/20200327/20200327031942-25286.png)
周期函数”,那么有函数①
![](http://img.shitiku.com.cn/uploads/allimg/20200327/20200327031943-68384.png)
②
![](http://img.shitiku.com.cn/uploads/allimg/20200327/20200327031943-40961.png)
③
![](http://img.shitiku.com.cn/uploads/allimg/20200327/20200327031944-33796.png)
④
![](http://img.shitiku.com.cn/uploads/allimg/20200327/20200327031945-23776.png)
,其中是“
![](http://img.shitiku.com.cn/uploads/allimg/20200327/20200327031942-25286.png)
周期函数”的有
(填上所有符合条件的函数前的序号)
【题文】定义在
![](http://img.shitiku.com.cn/uploads/allimg/20200327/20200327031928-45873.png)
上的偶函数
![](http://img.shitiku.com.cn/uploads/allimg/20200327/20200327031929-12950.png)
满足
![](http://img.shitiku.com.cn/uploads/allimg/20200327/20200327031929-65057.png)
,且在
![](http://img.shitiku.com.cn/uploads/allimg/20200327/20200327031929-85616.png)
上单调递增,设
![](http://img.shitiku.com.cn/uploads/allimg/20200327/20200327031930-73321.png)
,
![](http://img.shitiku.com.cn/uploads/allimg/20200327/20200327031930-53735.png)
,
![](http://img.shitiku.com.cn/uploads/allimg/20200327/20200327031930-73750.png)
,则
![](http://img.shitiku.com.cn/uploads/allimg/20200327/20200327031930-43989.png)
,
![](http://img.shitiku.com.cn/uploads/allimg/20200327/20200327031931-43018.png)
,
![](http://img.shitiku.com.cn/uploads/allimg/20200327/20200327031931-39889.png)
的大小关系是( )
【题文】已知定义在
![](http://img.shitiku.com.cn/uploads/allimg/20200327/20200327031914-26990.png)
上的奇函数
![](http://img.shitiku.com.cn/uploads/allimg/20200327/20200327031914-62495.png)
是周期函数,最小正周期是
![](http://img.shitiku.com.cn/uploads/allimg/20200327/20200327031915-12074.png)
.当
![](http://img.shitiku.com.cn/uploads/allimg/20200327/20200327031915-90283.png)
时,
![](http://img.shitiku.com.cn/uploads/allimg/20200327/20200327031916-49036.png)
,则
.
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