If n is a positive integer and r is the remainder when (n-1)(n+1) is divided by 24, what is the value of r? 1). n is not divisible by 2 2). n is not divisible by 3
(1) if n = 3, then (n - 1)(n + 1) = 8, so the remainder is 8 if n = 5, then (n - 1)(n + 1) = 24, so the remainder is 0 insufficient 答案是A 但是 1）里面 为什么不考虑 n=1 的情况呢？
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发表于 2009-11-20 15:18:33
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