题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102085906-89805.png)
A.$x0ÎR,![]() | B."xÎR,x2+2x+2>0 |
C."xÎR,x2+2x+2≤ | D.若![]() |
答案
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102085906-89805.png)
核心考点
试题【命题:$x0ÎR,+2x0+2≤0,该命题的否定是A.$x0ÎR,+2x0+2≥B."xÎR,x2+2x+2>0C."xÎR,x2+2x+2≤D.若+2x0+2】;主要考察你对四种命题等知识点的理解。[详细]
举一反三
①若
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102085846-41521.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102085846-48068.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102085847-44707.png)
②线性相关系数r的绝对值越接近于1,表明两个随机变量线性相关性越强;
③若
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102085847-39067.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102085847-61241.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102085847-42278.png)
④函数
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102085848-59514.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102085848-35325.png)
其中真命题个数是 ( )
A.4 | B. 3 | C. 2 | D. 1 |
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102085812-48278.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102085812-69878.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102085812-57855.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102085812-97632.png)
距为1;(3)直线
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102085813-28529.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102085813-84393.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102085813-62054.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102085813-84393.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102085813-49225.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102085814-85584.png)
(4)当
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102085814-72281.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102085814-37980.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102085814-61966.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102085815-41265.png)
A.0 | B.1 | C.2 | D.3 |
①
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102085806-27043.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102085807-41452.png)
②“p为真”是“p且q为真”的必要不充分条件;
③数列
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102085807-90859.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102085807-79904.png)
④a=2是f(x)=|x-a|在[2 ,+∞)上为增函数的充要条件。其中真命题的序号是________.
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102085739-94906.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102085739-42722.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102085739-67402.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102085739-24529.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102085740-73223.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102085739-94906.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102085739-67402.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102085740-54296.png)
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