题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103070920-65626.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103070920-18891.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103070920-14514.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103070920-13916.png)
A.充分不必要 | B.必要不充分 |
C.充要 | D.既不充分又不必要 |
答案
解析
试题分析:由x=3可推出
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103070921-66398.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103070921-66398.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103070920-14514.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103070920-13916.png)
点评:简单题,关键是理解充要条件的概念。
核心考点
举一反三
①若集合
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103070912-39522.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103070912-29502.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103070913-70985.png)
②给定命题
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103070913-43656.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103070913-68045.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103070913-32002.png)
③设
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103070913-43254.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103070914-67928.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103070914-57910.png)
④若直线
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103070914-51745.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103070914-34373.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103070914-15162.png)
其中正确命题的个数是( )
A.1 | B.2 | C.3 | D.4 |
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103070908-89895.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103070909-29465.png)
A.充分而不必要 | B.必要而不充分 | C.充要 | D.既不充分也不必要 |
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103070902-29121.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103070902-77813.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103070902-30299.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103070902-77649.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103070902-85119.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103070903-84659.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103070903-97188.png)
①
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103070903-65810.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103070903-56739.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103070903-97511.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103070903-20728.png)
其中能被称为“二维函数”的有_____________(写出所有满足条件的函数的序号).
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103070856-80914.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103070856-48999.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103070856-82531.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103070856-80914.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103070857-17413.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103070857-73702.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103070857-56354.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103070857-32472.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103070858-68612.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103070858-71467.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103070858-88575.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103070858-28857.png)
其中正确命题的个数是( )
A.0 | B.1 | C.2 | D.3 |
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103070850-66973.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103070850-27448.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103070850-28898.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103070850-31454.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103070850-27448.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103070850-82959.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103070850-80190.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103070850-66973.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103070851-29766.png)
①函数
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103070851-56225.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103070851-93791.png)
②函数
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103070851-13753.png)
③偶函数
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103070851-96537.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103070852-33614.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103070852-12687.png)
④在定义域上具有单调性的函数一定是单函数.
其中的正确的结论是 (写出所有正确结论的序号).
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