题目
题型:解答题难度:简单来源:不详
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817111824-55508.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817111824-87727.gif)
围:高 (Ⅰ)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817111825-25646.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817111825-21693.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817111825-53623.gif)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817111825-92105.gif)
(Ⅱ)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817111825-73691.gif)
(Ⅲ)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817111826-23573.gif)
解析
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817111825-25646.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817111826-96152.gif)
则
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817111826-74902.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817111826-76873.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817111825-92105.gif)
(Ⅱ)若
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817111825-21693.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817111825-21693.gif)
所以关于x的方程
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817111826-96152.gif)
①当
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817111826-17519.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817111826-21674.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817111826-74902.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817111827-38998.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817111827-90636.gif)
综上所述,
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817111824-87727.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817111825-73691.gif)
(Ⅲ)若
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817111827-55926.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817111828-38752.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817111828-16505.gif)
这等价于当
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817111828-30173.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817111828-11235.gif)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817111822-77414.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817111822-69899.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817111822-55548.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817111822-14973.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817111823-29304.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817111823-91969.gif)
A.6个 | B.5个 | C.4个 | D.少于4个 |
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817111819-36415.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817111819-22157.gif)
A.M | B.N | C.Æ | D.有限集 |
已知全集
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817111816-16246.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817111816-82743.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817111816-12803.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817111813-73303.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817111814-79684.gif)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817111812-95503.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817111812-48360.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817111813-34994.gif)
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