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一道prep的ds

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楼主
发表于 2008-11-20 13:17:00 | 只看该作者

一道prep的ds


If t is a positive integer and r is the remainder when t^2+5t=6 is divided by 7, what is the value of r?

(1) when t is divided by 7, the remainder is 6.

(2)when t^2 is divided by 7, the remainder is 1.

答案是A,但是为什么呀?

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