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75÷7餘5,所以75與5同餘(mod7)下麵都省略這個括弧 所以75^75與5^75同餘 所以75^75與125^25同餘 125÷7餘6 所以75^75與6^25同餘與(-1)^25同餘與(-1)同餘,所以是星期六.
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