When positive integer n is divided by 3, the remainder is 2; and when positive integer t is divided by 5, the remainder is 3.What is the remainder when the product nt is divided by 15 ?
(1) n - 2 is divisible by 5.
(2) t is divisible by 3. 这题目怎么做啊，都没法下手 我觉得有关整除，余数还有不等式的题目很绕啊，看起来像小学的，但分类讨论很烦啊，有套路么 。。。。。。。？
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发表于 2011-8-4 23:09:10
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