问题描述：
求助一道PREP 数学DS题...
If r and s are positive integers,is r/s an integer?(1) Every factor of s is also a factor of r.(2) Every prime factor of s is also a prime factor of r.但我觉得AB是一个道理,都不应该选啊...犯迷糊,..
If r and s are positive integers,is r/s an integer?(1) Every factor of s is also a factor of r.(2) Every prime factor of s is also a prime factor of r.但我觉得AB是一个道理,都不应该选啊...犯迷糊,..
问题解答：
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