數學趣味題或者真正的數學問題多的很，很多都需要想很多天的，怎麽會上課沒事？想自己的題啊。

來源: windyLL 於 2024-04-06 11:57:10 [舊帖] [給我悄悄話] 本文已被閱讀：次

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