已知集合
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c44b84cc8f1441a77200548e940d3424.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4b9b470218359a4a47be9244980489e.png)
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更新时间:2023-06-21 16:40:25
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【推荐1】已知实数集
,
,若对任意给定的实数
,总有集合
与集合
的交集不空,则称
为数集
的聚点.现在假设数集
,则下列四个命题中:①
为数集
的聚点;②
为数集
的聚点;③
为数集
的聚点;④
为数集
的聚点.则正确命题的个数为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a43b2faa4f81f32d94612dce724e772b.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45ba6b6aa6c3f9faba6b03bc193a6e61.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82299f10c55ff049dd08322e500de96c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8860d9787671b53b1ab68b3d526f5ca.png)
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解题方法
【推荐2】已知集合
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae1c649337ef8a0fc706cd8af1e1461b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1336d38741aab2255a35c26612bbd7cc.png)
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