2(a^2b+2b^3-ab^2)+3a^3-(2a^2b-3ab^2+3a^3)-4b^3
2(a^2b+2b^3-ab^2)+3a^3-(2a^2b-3ab^2+3a^3)-4b^3
数学人气：589 ℃时间：2019-08-22 19:28:23
优质解答
2(a^2b+2b^3-ab^2)+3a^3-(2a^2b-3ab^2+3a^3)-4b^3 = 2a^2b + 4b^3 - 2ab^2 + 3a^3 - 2a^2b + 3ab^2 - 3a^3 - 4b^3 = (-2 + 3)ab^2 = ab^2
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