题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102233744-63698.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102233744-96662.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102233744-19270.png)
A.充分而不必要条件 | B.必要而不充分条件 |
C.充要条件 | D.既不充分也不必要条件 |
答案
解析
试题分析:因为
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102233744-63698.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102233744-96662.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102233744-19270.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102233744-63698.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102233744-19270.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102233744-63333.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102233744-96662.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102233744-19270.png)
核心考点
举一反三
A.命题“若x2=1,则x=1”的否命题为:“若x2=1,则x≠1” |
B.“x=-1”是“x2-5x-6=0”的必要不充分条件 |
C.命题“∃x∈R,使得:x2+x+1<0”的否定是:“∀x∈R,均有x2+x+1<0” |
D.命题“若x=y,则sin x=sin y”的逆否命题为真命题 |
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102233734-90686.png)
②
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102233734-90716.png)
③设随机变量X~N(0,1),若P(X≥1)=p,则P(-1<X<0)=
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102233734-84503.png)
A.② | B.③ | C.②③ | D.①③ |
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102233729-99794.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102233729-62659.png)
A.∃x0∈R,ex0≤0 |
B.∀x∈R,2x>x2 |
C.a+b=0的充要条件是![]() |
D.a>1,b>1是ab>1的充分条件 |