已知集合
,
.
(1)若集合
为空集,求出实数
的取值范围;
(2)若
,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cc079920db5bea055bc0b7c288291d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90a38eaf2412ce598155297215d32552.png)
(1)若集合
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83a50765a95c11f9f5899ead16afc788.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3744e71abf4b43e128eabea9181b712.png)
更新时间:2020-02-19 17:23:10
|
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解答题-问答题
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容易
(0.94)
【推荐1】请问是否存在这样的集合,它的某一个元素同时又是它的子集?若存在,请举例;若不存在,请简要说明理由.
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解答题-问答题
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【推荐2】下列集合中哪些是空集?哪些是无限集?
(1)一元二次方程
的全体实根之集;
(2)所有素数之集;
(3)满足条件
和
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(4)满足条件
和
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(1)一元二次方程
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f92c4303ebef88f0862f8d625cd5356b.png)
(2)所有素数之集;
(3)满足条件
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f1a686b80b8f109a929f58c2de7201d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39d480f0fe759b6773d568ea7bcd2f19.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82a79a33a83a7ba57a34b5093d1d1d02.png)
(4)满足条件
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c988d709ba8cd8aed6cb83d76c0ba89c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39d480f0fe759b6773d568ea7bcd2f19.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82a79a33a83a7ba57a34b5093d1d1d02.png)
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解答题-问答题
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容易
(0.94)
【推荐1】已知集合
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c0a039974261dc072869894eeed2168.png)
(1)若
,求
;
(2)若
,求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3f07b3606a6b73c89ab1d6436ff49f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c0a039974261dc072869894eeed2168.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b550ee821ee1838384835e81fc34b67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3f48821a7cf6dfa90627f6718b8dac4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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名校
【推荐2】已知全集
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(1)求集合
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(2)若
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a64dc61989ca50b9ee19d835c4ed268.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e201927db1c28e4018dd2c147c582ffe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97176163dfa805c0246446c0c706a6d1.png)
(1)求集合
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c9f481cf82755e279c524b626a04630.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71e7d30d58ce4d3c20466962c315eb10.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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