题目
题型:解答题难度:简单来源:不详
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817094636-56125.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817094636-86832.png)
⑴
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817094637-88791.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817094637-49779.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817094637-84979.png)
⑵(
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817094637-48492.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817094638-71880.png)
解析
(1)利用数轴法得到集合A,B,然后根据并集的定义得到结论。
(2)因为
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817094638-81653.png)
解:⑴
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817094637-84979.png)
⑵∵
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817094638-81653.png)
∴(
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817094637-48492.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817094638-71880.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817094635-57337.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817094635-68791.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817094633-72446.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817094633-35608.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817094630-83538.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817094630-66507.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817094630-21640.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817094631-43002.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817094628-20743.png)
A.![]() ![]() ![]() | B.![]() ![]() ![]() |
C.![]() ![]() ![]() | D.![]() ![]() ![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817094624-42375.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817094625-86724.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817094626-28305.png)
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