81a五次方b五次方-ab=

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81a五次方b五次方-ab=81a五次方b五次方-ab=81a五次方b五次方-ab=81a五次方b五次方-ab==ab(81a^4*b^4-1)=ab(9a^2*b^2+1)(9a^2*b^2-1)=

81a五次方b五次方-ab=
81a五次方b五次方-ab=

81a五次方b五次方-ab=
81a五次方b五次方-ab=
=ab(81a^4*b^4-1)
=ab(9a^2*b^2+1)(9a^2*b^2-1)
=ab(9a^2*b^2+1)(3ab+1)(3ab-1)
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