题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103005915-34344.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103005915-95161.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103005915-36636.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103005915-73719.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103005916-12808.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103005916-71473.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
答案
解析
试题分析:因为
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103005916-12808.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103005916-71473.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103005916-71473.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103005916-12808.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103005915-73719.png)
由
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103005915-95161.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103005916-49961.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103005915-36636.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103005916-49961.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103005916-45844.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103005915-34344.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103005916-78063.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103005916-99655.png)
点评:基础题,充要条件的判断问题,是高考不可少的内容,特别是充要条件可以和任何知识点相结合。充要条件的判断一般有三种思路:定义法、等价关系转化法、集合关系法。本题运用了集合关系法。
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103005913-98228.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103005913-44195.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103005913-83766.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103005913-29956.png)
A.充分不必要条件 | B.必要不充分条件 |
C.充要条件 | D.既非充分条件也非必要条件 |
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103005909-76722.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103005909-33564.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103005910-44128.png)
A.充分不必要条件 | B.必要不充分条件 | C.充要条件 | D.既非充分又非必要 |
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103005905-36665.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103005905-90924.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103005906-73164.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103005906-57313.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/20191103/20191103005902-80619.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103005902-26894.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/20191103/20191103005858-73005.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103005858-64873.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103005859-29166.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103005859-61644.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103005859-89118.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103005858-73005.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103005859-29166.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 |
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