满足条件
的集合
有______ 个.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0f4226d6e18f1fb1d63fe4b5a0bd84e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
22-23高一上·广西河池·阶段练习 查看更多[2]
更新时间:2023-01-04 20:55:37
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【知识点】 判断集合的子集(真子集)的个数
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【推荐1】若集合
满足![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://img.xkw.com/dksih/QBM/2015/1/5/1571948313206784/1571948318982144/STEM/a6b46b5cdbaa419e97964d46fffa2944.png?resizew=15)
,则这样的集合
有____________ 个.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://img.xkw.com/dksih/QBM/2015/1/5/1571948313206784/1571948318982144/STEM/a6b46b5cdbaa419e97964d46fffa2944.png?resizew=15)
![](https://img.xkw.com/dksih/QBM/2015/1/5/1571948313206784/1571948318982144/STEM/1cc913dadf37436aac00579ef827f496.png?resizew=36)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
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【推荐2】若全集
且
,则集合A的真子集共有______________ 个.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f047fef694ecb6cae51c941fdf0fdb22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/767478c0b818d4c132d0dc46bc496d2c.png)
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