题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103080605-43939.png)
②命题“
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103080605-80127.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103080605-72594.png)
③“若
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103080605-32310.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103080606-24273.png)
④集合
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103080606-10237.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103080606-93715.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103080606-23628.png)
充要条件则其中正确结论的序号为 ( )
A.①③ | B.①② | C.②③④ | D.①②④ |
答案
解析
因为
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103080607-31333.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103080607-30717.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103080607-96504.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103080608-52990.png)
命题“
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103080605-80127.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103080605-72594.png)
“若
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103080605-32310.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103080606-24273.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103080606-24273.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103080605-32310.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103080608-14756.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103080608-48035.png)
由
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103080609-34454.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103080609-16187.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103080609-11968.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103080609-98829.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103080609-93647.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103080610-14413.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103080606-23628.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103080606-93715.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103080606-23628.png)
必要条件,④错.
综上,正确答案为B
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103080554-75225.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103080554-79555.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103080554-27289.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103080555-11147.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103080555-76741.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103080555-51069.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103080555-20757.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103080555-11329.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103080556-41948.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103080556-22856.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103080550-27531.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103080550-49074.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103080550-83655.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103080550-55287.gif)
A.充分而不必要条件 | B.必要而不充分条件 |
C.充分必要条件 | D.即不充分也不必要条件 |
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103080546-94544.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103080546-80043.png)
①“若x2+y2≠0,则x,y不全为零”的否命题;
②“等腰三角形都相似”的逆命题;
③“若
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103080541-43672.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103080541-89954.png)
④“若
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103080541-13410.png)
A.①②③④ | B.①③④ | C.②③④ | D.①④ |
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103080535-74424.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103080535-47512.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103080535-40642.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103080535-75716.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103080535-47512.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103080535-82254.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103080535-74424.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103080535-75716.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103080535-50980.gif)
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