已知集合
,则
中元素的个数为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c8133ca3f7657c8a336848718d92d9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fdbfa7a63fdf5717d40c8c9a73ec160.png)
更新时间:2023-11-04 11:10:14
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