题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102125317-45559.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102125318-89631.gif)
②“
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102125318-42032.gif)
③“若xy=0,则x、y中至少有一个为0”的否命题是真命题.;
④若p是q的充分条件,r是q的必要条件,r是s的充要条件,则s是p的必要条件;
其中是真命题的有:_ __ ▲ _.(把你认为正确命题的序号都填上)
答案
解析
核心考点
试题【有下列命题:①双曲线与椭圆有相同的焦点;②“”是“2x2-5x-3<0”必要不充分条件;③“若xy=0,则x、y中至少有一个为0”的否命题是真命题.;④若p是q】;主要考察你对四种命题等知识点的理解。[详细]
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102125259-49782.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102125259-86457.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102125259-40650.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102125300-84770.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102125300-84770.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102125253-61635.gif)
①若
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102125253-52563.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102125253-93450.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102125254-87806.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102125254-22873.gif)
③若
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102125254-82989.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102125255-77574.gif)
④若
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102125255-93408.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102125255-20479.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102125255-61638.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102125256-93993.gif)
其中所有正确命题的序号是
①如果平面
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102125237-78054.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102125238-91723.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102125238-46581.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102125237-78054.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102125238-46581.png)
②如果直线
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102125238-91723.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102125238-46581.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102125238-91723.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102125238-46581.png)
③如果直线
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102125238-91723.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102125238-46581.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102125238-91723.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102125238-46581.png)
④如果平面
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102125237-78054.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102125238-46581.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102125238-91723.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102125238-46581.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102125227-57963.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102125228-99456.gif)
则
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102125228-40651.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102125228-37150.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102125228-87697.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102125229-97362.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102125229-70974.gif)
④若
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102125229-45596.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102125229-47034.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102125230-80918.gif)
A.![]() | B.![]() |
C.![]() | D.![]() |
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