問功課, please!
回答 (3)
2007-05-14 4:22 am
✔ 最佳答案
用方程式計吧!兩位數字:(Xx10+Y),兩個數字間加入"0":Xx100+0+Y
7(Xx10+Y)=Xx100+0+Y
7(10X+Y)=100X+Y
70X+7Y=100X+Y
6Y=30X
Y=5X
In such condition, only Y=1 and X=5 is possible.
=15//
2007-05-15 2:12 am
原來的數字是15
1 0 5=15*7
1 0 5=15*7
2007-05-14 4:12 am
原來的數字是15
2007-05-13 20:12:49 補充：
因為15x7是105
2007-05-13 20:12:49 補充：
因為15x7是105
收錄日期: 2021-04-18 22:11:14
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20070513000051KK04455