1 . 已知集合
.
(1)若
是空集,求实数
的取值范围;
(2)若
中只有一个元素,求实数
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbdb52aaccd1a3ec0d85194720504beb.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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2020-06-25更新
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3卷引用:四川省凉山州2019-2020高一上学期期末考试数学试题