题目
题型:不详难度:来源:
①对所有正数
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102082202-55586.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102082202-63244.png)
②不存在实数
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102082202-82073.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102082202-31360.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102082203-84213.png)
③存在实数
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102082202-82073.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102082203-98243.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102082203-51763.png)
④
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102082203-13778.png)
A.![]() | B.![]() | C.![]() | D.![]() |
答案
解析
试题分析:对于①对所有正数
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102082202-55586.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102082202-63244.png)
对于②不存在实数
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102082202-82073.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102082202-31360.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102082203-84213.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102082205-50573.png)
对于③存在实数
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102082202-82073.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102082203-98243.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102082205-25998.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102082203-51763.png)
对于④
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102082203-13778.png)
点评:解决的关键是对于全称命题和特称命题的理解运用,属于基础题。
核心考点
举一反三
①“若
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102082143-69462.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102082143-86728.png)
②“面积相等的三角形全等”的否命题;
③“若
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102082144-80699.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102082144-61097.png)
④“若
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102082144-90902.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102082144-17677.png)
其中真命题的是 .
①积分
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102082114-30802.png)
②若
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102082114-33363.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102082114-59629.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102082114-76570.png)
③若
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102082115-41448.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102082115-67973.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102082115-38714.png)
④函数
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102082116-78610.png)
A.周期函数的和是周期函数吗? | B.梯形是不是平面图形呢? |
C.![]() | D.![]() |
①在
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102082051-40422.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102082052-12852.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102082052-21106.png)
②
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102082052-11507.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102082053-49753.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102082053-22794.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102082053-44116.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102082053-15906.png)
③数列
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102082053-49753.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102082054-11698.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102082054-58397.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102082054-58089.png)
④数列
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102082053-49753.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102082054-86299.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102082055-10603.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102082055-91199.png)
其中正确的命题序号 (注:把你认为正确的序号都填上)
(1)若向量
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102082041-43699.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102082042-10398.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102082042-79717.png)
(2)对于任意非零向量若
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102082041-43699.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102082042-10398.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102082042-79717.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102082042-28701.png)
(3)非零向量
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102082042-10398.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102082042-79717.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102082042-54678.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102082042-10398.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102082042-79717.png)
(4)向量
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102082043-60278.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102082043-41298.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102082043-88639.png)
(5)若
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102082042-54678.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102082043-76015.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102082044-45847.png)
正确的个数:( )
A.0 | B.1 | C.2 | D.3 |
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