题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103004108-11693.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103004108-85864.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103004108-11519.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103004108-72700.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103004108-86244.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103004108-85864.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103004109-68122.png)
(1)若
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103004109-40122.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103004109-67937.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103004108-85864.png)
(2)若
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103004108-11693.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103004108-86244.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103004109-74287.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103004109-25253.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103004109-48763.png)
解析
试题分析:先根据题意化简给出的两个命题:
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103004109-42719.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103004109-11153.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103004109-40122.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103004109-73011.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103004109-67937.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103004110-88392.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103004108-85864.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103004110-88392.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103004108-86244.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103004108-11693.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103004108-86244.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103004108-11693.png)
试题解析:(1)由
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103004108-11519.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103004110-29244.png)
又
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103004108-72700.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103004110-83736.png)
当
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103004109-40122.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103004110-78263.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103004108-11693.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103004108-85864.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103004110-78263.png)
由
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103004109-68122.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103004110-56656.png)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103004108-86244.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103004108-85864.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103004110-56656.png)
若
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103004109-67937.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103004110-82318.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103004108-85864.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103004109-25253.png)
(2)设
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103004110-83402.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103004110-99778.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103004108-86244.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103004108-11693.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103004110-62798.png)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103004110-44549.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103004109-74287.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103004109-48763.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103004103-62135.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103004103-89604.png)
⑴若命题
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103004103-38483.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103004104-95395.png)
⑵判断命题
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103004103-38483.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103004104-22517.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103004059-54492.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103004059-35239.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 |
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103004055-61514.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103004056-33153.png)
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.既不充分也不必要条件 |
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103004052-71076.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103004052-56453.png)
A.充分不必要条件 | B.必要不充分条件 |
C.充要条件 | D.既不充分又不必要条件 |
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103004047-84646.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103004047-41222.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191103/20191103004047-71055.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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