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标题: 请教这道题 [打印本页]

作者: nicexiaoye 时间: 2002-12-13 07:20 标题: 请教这道题

39,小于500的正整数中，被7除余1 ，且被3除余2的数有多少？

作者: monkey2002 时间: 2002-12-13 08:31

it is so easy to solve this question:

1, find the both initial numbers, such as for 7a+1, and 3b+2,...8 is the first number you need to have.
2. since 7 and 3 are prime numbers, so 3*7=21 is the different in such number list, so then you can solve this. Hope hlpes

作者: nicexiaoye 时间: 2002-12-13 09:08

Thanks a lot

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