标题:
請問數學一題
[打印本页]
作者:
observer
时间:
2005-5-20 06:50
标题:
請問數學一題
Sorry I have a data sufficiency question. Anyone please help???
If S is a set of intergers and 5 is in S, is every multiple of 5 in S ?
1. If x is in S, then x+5 is in S.
2. If x is in S, then x - 5 is in S.
the answer is C.
Could anyone explain why? Thank you
作者:
himba
时间:
2005-5-20 06:51
如果5在集合S中,则(1)10,15,20,..., 5+5M(M为自然数)在集合S中;(2)0,-5,-10,...,5-5N(N为自然数)在集合S中,由(1)+(2)得5+5i(i为整数)在集合S中,即every multiple of 5 in s 。
欢迎光临 国际顶尖MBA申请交流平台--TOPWAY MBA (http://forum.topway.org/)
Powered by Discuz! 7.2