集合
,
,则
的真子集个数________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a4454e0d2129a2c9d0b6761eb39394e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d77eed7aa4959ec041bc368b09dfe6ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fdbfa7a63fdf5717d40c8c9a73ec160.png)
更新时间:2023-12-27 10:55:33
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