prep-38，又来麻烦大家啦

rock19840717

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.
 

答案给A，我觉得是D，条件二说所有的质数，没说不同的，小弟以为任何合数都可以拆成数个质数的积，那应该也可以确保r/s是整数了吧。。。。请教了！

rock19840717

哎呀，忘了个数了，傻了，谢谢LS，你留个邮箱，一会我传给你