81a的5次方b的5次方-ab

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81a的5次方b的5次方-ab

81a^5b^5-ab
=ab(81a^4b^4-1)
=ab(9a^2b^2+1)(9a^2b^2-1)
=ab(9a^2b^2+1)(3ab+1)(3ab-1)