题目
题型:解答题难度:简单来源:不详
已知集合
![](http://img.shitiku.com.cn/uploads/allimg/20190815/20190815002251-45140.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190815/20190815002251-86870.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190815/20190815002251-13922.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20190815/20190815002252-16507.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190815/20190815002252-79020.png)
解析
先分析二次项系数是否为零,来分情况讨论得到结论。
解:①当
![](http://img.shitiku.com.cn/uploads/allimg/20190815/20190815002252-16507.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190815/20190815002252-75046.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190815/20190815002252-52435.png)
②当
![](http://img.shitiku.com.cn/uploads/allimg/20190815/20190815002252-56091.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190815/20190815002253-58426.png)
则
![](http://img.shitiku.com.cn/uploads/allimg/20190815/20190815002253-91513.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190815/20190815002253-81652.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190815/20190815002253-56490.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190815/20190815002252-52435.png)
综上所述,
![](http://img.shitiku.com.cn/uploads/allimg/20190815/20190815002251-13922.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190815/20190815002252-16507.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190815/20190815002252-79020.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190815/20190815002252-52435.png)
核心考点
举一反三
A.5个 | B.6个 | C.7个 | D.8个 |
![](http://img.shitiku.com.cn/uploads/allimg/20190815/20190815002244-45613.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190815/20190815002244-25321.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190815/20190815002244-29856.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190815/20190815002244-55648.png)
A.0个 | B.1个 | C.2个 | D.3个 |
![](http://img.shitiku.com.cn/uploads/allimg/20190815/20190815002242-53702.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190815/20190815002242-21903.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190815/20190815002242-84001.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190815/20190815002243-29924.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190815/20190815002243-61700.png)
A.9 | B.7 | C.6 | D.8 |
![](http://img.shitiku.com.cn/uploads/allimg/20190815/20190815002237-31145.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190815/20190815002238-15881.png)
A.![]() | B.![]() | C.![]() | D.![]() |
A.![]() | B.![]() | C.![]() | D.![]() |
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