已知集合
,
,则
的子集个数______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc3be29927acaa5c45197bf18b71f420.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/684ca0cdb2b9975214bb0839a0df624d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c81919684bc4047d376c7e57dc6c8f1c.png)
更新时间:2024-05-24 21:56:41
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