题目内容
命题p:
<0,则
的夹角为钝角,命题q:定义域为R的函数
上都是增函数,则
上是增函数,下列说法正确的是( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140823/20140823193853698432.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140823/20140823193853807457.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140823/20140823193853823959.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140823/20140823193853839766.png)
A.“p且q”是假命题 | B.“p或q”是真命题 |
C.![]() | D.![]() |
A
当
时,
的夹角为
不是钝角;所以命题
是假命题;命题
是假命题;例如函数
;故选A
![](http://thumb.1010pic.com/pic2/upload/papers/20140823/20140823193853885556.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140823/20140823193853807457.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140823/20140823193853932457.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140823/20140823193853963313.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140823/20140823193853963310.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140823/201408231938539791099.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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题目内容
A.“p且q”是假命题 | B.“p或q”是真命题 |
C.![]() | D.![]() |