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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：我

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