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2010.9.20

2010-09-20 15:39:51| 分类： Day Day up | 标签： |举报 |字号大中小订阅

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难度：★★★★

数论问题
写出从360到630的自然数中有奇数个约数的数．

难度：★★★★★

数论问题

甲、乙两数的最小公倍数是90，乙、丙两数的最小公倍数是105，甲、丙两数的最小公倍数是126，那么甲数是多少?

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