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3的1次方末尾為3 3的2次方末尾為9 3的3次方末尾為7 3的4次方末尾為1 3的5次方末尾為3 所以3的2010次方末尾為9
4 2的1次方個位2 2的2次方個位4 2的3次方個位8 2的4次方個位6 2的5次方個位2 2010 mod 4 =2 2的2010次方個位數與2的2次方個位數一樣是4
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