题目
题型:不详难度:来源:
①命题“若
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103072436-38206.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103072436-65489.png)
②“x2-3x+2=0”是“x=2”的必要不充分条件
③命题“若xy=0,则x,y中至少有一个为零”的否定是:“若xy≠0,则x,y都不为零”
④命题p:∃x∈R,使得x2+x+1
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103072436-39015.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103072437-48004.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103072437-91228.png)
⑤若命题
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103072437-48004.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103072437-23183.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103072437-89796.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103072438-29895.png)
A.1 | B.2 | C.3 | D.4 |
答案
解析
①命题“若
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103072436-38206.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103072436-65489.png)
②“x2-3x+2=0”是“x=2”的必要不充分条件,成立,
③命题“若xy=0,则x,y中至少有一个为零”的否定是:“若xy≠0,则x,y都不为零”,成立,
④命题p:∃x∈R,使得x2+x+1
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103072436-39015.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103072437-48004.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103072437-91228.png)
⑤若命题
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103072437-48004.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103072437-23183.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103072437-89796.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103072438-29895.png)
故选A
核心考点
试题【下列说法错误的个数为( )①命题“若,则一元二次方程有实根”的逆否命题是真命题②“x2-3x+2=0”是“x=2”的必要不充分条件③命题“若xy=0,则x,】;主要考察你对简单逻辑联结词等知识点的理解。[详细]
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103072432-41787.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103072432-73503.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103072432-41787.png)
A.充分不必要条件 | B.必要不充分条件 |
C.充要条件 | D.既不充分也不必要条件 |
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103072428-64807.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103072428-62261.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103072429-19887.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103072429-15486.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103072429-38400.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103072429-94078.png)
A.1个 | B.2个 | C.3个 | D.4个 |
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103072425-84862.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103072425-73486.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103072425-31545.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103072426-59630.png)
①若
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103072425-84862.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103072425-73486.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103072425-31545.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103072425-84862.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103072425-73486.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103072425-84862.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103072425-73486.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103072425-31545.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103072425-84862.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103072425-73486.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103072425-31545.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103072426-59630.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103072425-84862.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103072425-73486.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103072426-42787.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103072425-84862.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103072425-73486.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103072425-31545.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103072425-84862.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103072425-73486.png)
A.![]() | B.命题“若![]() |
C.![]() | D.命题“若![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103072413-94637.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103072414-35889.png)
(Ⅰ)求函数
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103072414-36454.png)
(Ⅱ)已知
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103072414-51919.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103072414-79874.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103072415-85462.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103072415-30958.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103072414-35889.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103072415-64609.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103072415-33563.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103072414-79874.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103072415-64609.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103072414-79874.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103072415-64609.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103072416-91158.png)
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