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結果無法求,但末尾數位可求. 3的一次方末尾為3 3的二次方末尾為9 3的三次方末尾為7 3的四次方末尾為1 3的五次方末尾為3 故可得到規律每四次方末尾迴圈一次,2010=4*502+2 故3的2010次方的末尾為9,3的2010次方-2的末尾為7
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