[數學]PURE既set問題
回答 (1)
2007-10-14 9:37 am
✔ 最佳答案
唔係。{{1}U{2}} = {{1, 2}}
{{1},{2},{3}} 裏面冇一個element係{1,2}
收錄日期: 2021-04-23 17:19:18
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