(3a的平方b-2ab的平方)*3ab-2(1-3x/2)-4x(2-x/4)2x^2(-3xy^2)-x(x^2y^2-2x)

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(3a的平方b-2ab的平方)*3ab-2(1-3x/2)-4x(2-x/4)2x^2(-3xy^2)-x(x^2y^2-2x)

(3a的平方b-2ab的平方)*3ab-2(1-3x/2)-4x(2-x/4)2x^2(-3xy^2)-x(x^2y^2-2x)
(3a的平方b-2ab的平方)*3ab
-2(1-3x/2)-4x(2-x/4)
2x^2(-3xy^2)-x(x^2y^2-2x)

(3a的平方b-2ab的平方)*3ab-2(1-3x/2)-4x(2-x/4)2x^2(-3xy^2)-x(x^2y^2-2x)
(3a的平方b-2ab的平方)*3ab
=9a^3b^2-6a^2b^3
-2(1-3x/2)-4x(2-x/4)
=-2+3x-8x+x^2
=-2-5x+x^2
2x^2(-3xy^2)-x(x^2y^2-2x)
=-6x^3y^2-x^3y^2+2x^2
=-7x^3y^2+2x^2