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看尾數9乘1個9尾數是1,再乘一個9尾數又成9了,就是說2n個9相乘尾數為1,2n+1個9相乘尾數為9,即2003個9相乘尾數為9 再看8相乘尾數會有4、2、6、8、4的迴圈管,即每多4個8相乘尾數是一樣的,即2004個8的尾數等同於4個8相乘的尾數,即6(-8的2004次方為正數) 即9+6=15 取尾數即為5
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