回複：四位平方數，前兩位和後兩位都相同，怎麽求？（知道是7744，但怎麽推呢？

來源: 於 2010-06-16 21:08:58 [舊帖] [給我悄悄話] 本文已被閱讀：次

Some times,"logic guess" is best.
11^2=121,so,121*x^2=aabb,x^2=81 is not good ,64 is OK.
121*64=7744.