設此正整數=10X + Y ,則新數=X 10X + Y =13X → Y=3X 所以答案只有上面發表的3個數
若設此數為 100X +10Y + Z ,新數=10X + Y 100X + 10Y + Z = 13 ( 10X + Y ) = 130X + 13Y Z=30X + 3Y →←
_________________
2003-03-21 20:54
九章數學出版社、九章數學基金會版權所有 本網頁各鍊結標題及鍊結內容歸原權利人所有 Copyright 2000 ~2004九章數學出版社、九章數學基金會 本網站內所有文字及資料版權均屬九章所有,未經書面同意之商業用途必究 This web site was made with XOOPS, a web portal system written in PHP. XOOPS is a free software released under the GNU/GPL license.