(-3a^2b^3)^2·4(-a^3b^2)^=
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(-3a^2b^3)^2·4(-a^3b^2)^=(-3a^2b^3)^2·4(-a^3b^2)^=(-3a^2b^3)^2·4(-a^3b^2)^=-ab^3=(a^4-a^3b)+(3ab^2-3
(-3a^2b^3)^2·4(-a^3b^2)^=
(-3a^2b^3)^2·4(-a^3b^2)^=
(-3a^2b^3)^2·4(-a^3b^2)^=
-ab^3
=(a^4-a^3b)+(3ab^2-3a^2b)+(b^4-ab^3)
=a^3(a-b)-3ab(a-b)-b^3(a-b)
=a^3-3ab-b3
=(a^3-b^3)-3ab
=(a-b)(a^2+ab+b^2)-3ab
=a^2+ab+b^2-3ab
=a^2-2ab+b^2
=(a-b)^2
=1
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