已知集合
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/715476727accc3c6b3c71f2f25c3aaad.png)
__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b4697c4915c2fd7d5c87a975a01b05e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/715476727accc3c6b3c71f2f25c3aaad.png)
更新时间:2020-11-15 15:54:09
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填空题-单空题
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容易
(0.94)
解题方法
【推荐1】设
,
,则
的真子集的个数为_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa4f59a3fd052f229e79e5aefa517913.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/141bca64b2f409a93f2a7a9d5a32d599.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9b96b11606feacee1f9aa2c55f8f82f.png)
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