化简.(9a^2b^3-12a^4b^5)+3a^2b-b^2(2+3a^2b^2)

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化简.(9a^2b^3-12a^4b^5)+3a^2b-b^2(2+3a^2b^2)化简.(9a^2b^3-12a^4b^5)+3a^2b-b^2(2+3a^2b^2)化简.(9a^2b^3-12a^

化简.(9a^2b^3-12a^4b^5)+3a^2b-b^2(2+3a^2b^2)
化简.(9a^2b^3-12a^4b^5)+3a^2b-b^2(2+3a^2b^2)

化简.(9a^2b^3-12a^4b^5)+3a^2b-b^2(2+3a^2b^2)
(9a^2b^3-12a^4b^5)+3a^2b-b^2(2+3a^2b^2)
= 9a^2b^3-12a^4b^5+3a^2b-2b^2+3a^2b^4