化简:5(3x2y-xy2) * (xy2+3x2y)

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化简:5(3x2y-xy2) * (xy2+3x2y)

5(3x^2y-xy^2)(xy^2+3x^2y)
=5[(3x^2y-xy^2)(3x^2y+xy^2)]
=5[(3x^2y)^2-(xy^2)^2]
=5(9x^4y^2-x^2y^4)
=45x^4y^2-5x^2y^4