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Yahoo!奇摩知識+ - 分類問答 - 科學常識 - 投票中 
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小五數學(倍數)
Sep 30th 2013, 13:44

1.某數被15除不足9,用25除餘下6,某數最小多少?
被15除不足9,也就是說被15除會餘6
題目問的是被15除或被25除會餘下6的數,
滿足要求的數是15和25的公倍數加上6
最小的數是 6
15和25的最小公倍數是75,75的0倍加6,最小是6

2.某數用6除之不足2,用7除之餘5,某數最小多少?
用7除會餘5,也就是用7除會不足2,題目要的數被6或7除都少2
滿足要求的數是6、7的公倍數減去2
最小的數是40
6和7的最小公倍數是42,42的0倍減2小於零,不能用
所以用42的1倍減2,最小是40

參考資料:

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