题目
题型:单选题难度:简单来源:不详
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817100219-16958.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817100219-33183.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817100219-11747.png)
A.![]() | B.![]() | C.![]() | D.![]() |
答案
解析
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817100220-87479.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817100220-97985.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817100216-10310.png)
(1)若
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817100216-79270.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817100210-36278.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817100210-62947.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817100211-48068.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817100211-29753.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817100211-71276.png)
(1)求集合
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817100211-90458.png)
(2)若
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817100211-72809.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817100212-85039.png)
(3)若存在
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817100212-88249.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817100212-23946.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817100212-85039.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817100208-43328.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817100208-42706.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817100206-67462.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817100206-40825.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817100206-32554.png)
A.![]() | B.![]() | C.{-1,0,1} | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817100203-62183.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817100203-62838.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
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