因式分解(81a^2+16b^2-72a^2b^2

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因式分解(81a^2+16b^2-72a^2b^2因式分解(81a^2+16b^2-72a^2b^2因式分解(81a^2+16b^2-72a^2b^2(81a^2+16b^2-72a^2b^2=(9a

因式分解(81a^2+16b^2-72a^2b^2
因式分解(81a^2+16b^2-72a^2b^2

因式分解(81a^2+16b^2-72a^2b^2
(81a^2+16b^2-72a^2b^2
=(9a)^2-2*9a*4b+(4b)^2
=(9a-4b)^2

俊狼猎英团队为您解答

81a^4+16b^4-72a^2b^2
=(9a^2-4b^2)^2
=(3a-2b)^2(3a-2b)^2

81a^2+16b^2-72a^2b^2
=(9a-4b)^2

81a^2+16b^2-72a^2b^2

=(9a-4b)^2 -72ab(ab-1)