解题方法
1 . 已知集合
,
,
,求:
(1)当
时,
中至多只有一个元素,求
的取值范围;
(2)当
时,
中至少有一个元素,求
的取值范围;
(3)当
、
满足什么条件时,集合
为非空集合.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6dad7283123d69c588b8939095acefcc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1e69392d21261afd8e5e5f096634669.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10727b6dda0c8627b13bcec8230d7de6.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03837b3769eda7f0d3804cc5ad4a6d60.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f06408895febc126c2ae409e807349c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
您最近一年使用:0次
2016-12-03更新
|
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2卷引用:广西钦州市钦州港经济技术开发区中学2018届高三理科数学开学考试试题
2011·广西南宁·二模
2 . 已知集合
且
,则实数a的取值范围是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71182f473e2649f5a776c0898081be41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84551d3fb6b37a4f5a3162ecceb475aa.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次