1既2次方+2既2次方+3既2次方+........+30既2次方..
列埋出黎俾我睇絛數點計.....
收錄日期: 2021-04-13 11:59:16
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20070813000051KK02614