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星期二1997是7*285+21997的1997次方可以看做是(7*285+2)的1997次方根據二次項定理可以知道,2的1997次前都是7的倍數讓後判斷22的1次整除7的餘數是2;2的2次整除7的餘數是4;2的3次整除7的餘數是1;2的4次整除7的餘…
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