题目内容
设函数
在
上的导函数为
,
在
上的导函数为
,若在
上,
恒成立,则称函数
在
上为“凸函数”.已知当
时,
在
上是“凸函数”,则
在
上( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824023034158562.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824023034173476.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824023034173466.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824023034173466.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824023034173476.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824023034236471.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824023034173476.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824023034251555.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824023034267447.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824023034173476.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824023034376467.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408240230343921231.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824023034423484.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824023034267447.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824023034423484.png)
A.既没有最大值,也没有最小值 | B.既有最大值,也有最小值 |
C.有最大值,没有最小值 | D.没有最大值,有最小值 |
A
试题分析:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408240230344851168.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824023034158562.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824023034423484.png)
所以
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824023034532716.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824023034423484.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824023034579437.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824023034423484.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824023034610464.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408240230346261181.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824023034267447.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824023034423484.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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题目内容
A.既没有最大值,也没有最小值 | B.既有最大值,也有最小值 |
C.有最大值,没有最小值 | D.没有最大值,有最小值 |