ChaseDream

标题: 【求助一道DS题】 [打印本页]

作者: Joyce74    时间: 2018-1-5 14:29
标题: 【求助一道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

答案是A   
可是条件2为什么不充分呢?
Thanks♪(・ω・)ノ


作者: kexzhang    时间: 2018-1-5 14:41
举个例子,如果S=2^3*3^2,R=2^2*3^3, R/S=108/72, 这不就不是整数了么




欢迎光临 ChaseDream (https://forum.chasedream.com/) Powered by Discuz! X3.3