作业帮[ab(3-b)-2a(b-1/2b^2)]x(-3a^2b^3)=
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![[ab(3-b)-2a(b-1/2b^2)]x(-3a^2b^3)=](/uploads/image/z/1805808-48-8.jpg?t=%5Bab%283-b%29-2a%28b-1%2F2b%5E2%29%5Dx%28-3a%5E2b%5E3%29%3D)
[ab(3-b)-2a(b-1/2b^2)]x(-3a^2b^3)=
[ab(3-b)-2a(b-1/2b^2)]x(-3a^2b^3)=
[ab(3-b)-2a(b-1/2b^2)]x(-3a^2b^3)=
[ab(3-b)-2a(b-1/2b^2)]x(-3a^2b^3)
=[3ab-ab^2-2ab+ab^2]*(-3a^2b^3)
=ab*(-3a^2b^3)
=-3a^3b^4