[GRE数学]If -m/19 is an even integer,which of the following must be true?
问题描述:
[GRE数学]If -m/19 is an even integer,which of the following must be true?
问m是什么数.给出五个选项,分别是 A:negative number(负数),B:positive number(正数),C:prime number(质数) ,D:odd integer(奇数) ,E:even integer(偶数) .
答
E偶数啊 除以19都是偶数,那把19乘上去还是偶数.
但是正负是不能判断的,因为偶数也有正负之分,这里没说 -M/19是正是负,那就不知道了