题目
题型:解答题难度:一般来源:不详
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817083523-46803.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817083523-68151.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817083523-33309.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817083523-81320.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817083523-26436.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817083524-57790.png)
解析
试题分析:本题考查的是分类讨论的思想.即通过分类讨论,把一个大问题分解成若干个小问题的并集.在本题中,要使
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817083523-33309.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817083524-89526.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817083524-29096.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817083524-89526.png)
试题解析:∵
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817083523-46803.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817083524-10909.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817083523-33309.png)
所以集合B有以下几种情况
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817083524-57622.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817083525-65871.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817083525-41696.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817083525-33378.png)
分三种情况①当
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817083524-57622.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817083525-43246.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817083526-29381.png)
②当
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817083525-65871.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817083526-39980.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817083526-59571.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817083526-59416.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817083525-41696.png)
③当
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817083525-33378.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817083526-43519.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817083524-57790.png)
综上,所求实数
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817083523-81320.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817083523-26436.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817083524-57790.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817083520-92804.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817083520-68829.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817083521-51767.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817083518-89048.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817083518-97068.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817083518-11074.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817083515-55034.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817083513-23726.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817083513-76053.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817083513-89829.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817083508-35237.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817083509-55678.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817083509-73679.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817083509-38691.png)
A.-1 | B.0 | C.1 | D.1或-1 |
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