题目
题型:不详难度:来源:
(1)3=2
(2)5>4
(3)对任意实数x,x>0
(4)每个正方形是平行四边形
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103071817-11799.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103071818-97439.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103071818-97439.png)
解析
试题分析:(1)3=2的否定:3
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103071817-11799.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103071818-97439.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103071818-97439.png)
点评:命题的否定只否定结论,对于全称命题、特称命题还要互换“量词”。
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103071810-38524.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103071811-67492.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
(1)“末位数字是0或5的整数能被5整除”的否命题;
(2)“任何实数x都是方程5x-12=0的根”的否定;
(3)“对于任意实数x,存在实数y,使x+y>0”的否定
(4)“若
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103071801-60432.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103071801-74305.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103071754-95424.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103071754-87965.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103071755-85913.png)
A.充要条件 | B.必要不充分条件 |
C.充分不必要条件 | D.既不充分又不必要条件 |
①命题“若
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103071748-77109.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103071749-89452.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103071748-77109.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103071749-99037.png)
②命题
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103071749-40108.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103071750-56133.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103071750-27959.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103071750-41514.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103071750-28226.png)
③若
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103071749-40108.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103071750-11708.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103071749-40108.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103071750-11708.png)
④
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103071751-31152.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103071751-51071.png)
A.1 | B.2 | C.3 | D.4 |
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