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7的4次方的個位數是1 7的2010次方=7的4次方的502次方乘以7^2 ∴7的2010次方的個位數是9
2的一次方末尾為2二次為4,三次為8,四次為6,五次為2,所以順序是2、4、8、6,所以2的100次方末尾是6····3的1次方的個位數是3,3的二次方的個位數是9,3的三次方的個位數是7,3的4次方的個位數是1,3的5次方的個位數是3,…
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