标题: 求助两道prep上的题目 [打印本页] 作者: echo19872006 时间: 2010-4-16 06:16 标题: 求助两道prep上的题目 1. how many intergers n is 2^n=n^2？ 答案是 2个 是哪两个啊？
2. n is positive integers, r is remainder when(n+1)(n-1) is divided by 24, what's the value of r? 1. n is not divisible by 2 2. n is not divisible by 3 答案是 C 这个是怎么做的啊？