计算2a^2(1/2ab^2-b)-(a^2b^2-ab)计算2a^2(1/2ab^2-b)-(a^2b^2-ab)*(-3a)

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计算2a^2(1/2ab^2-b)-(a^2b^2-ab)计算2a^2(1/2ab^2-b)-(a^2b^2-ab)*(-3a)计算2a^2(1/2ab^2-b)-(a^2b^2-ab)计算2a^2(

计算2a^2(1/2ab^2-b)-(a^2b^2-ab)计算2a^2(1/2ab^2-b)-(a^2b^2-ab)*(-3a)
计算2a^2(1/2ab^2-b)-(a^2b^2-ab)
计算2a^2(1/2ab^2-b)-(a^2b^2-ab)*(-3a)

计算2a^2(1/2ab^2-b)-(a^2b^2-ab)计算2a^2(1/2ab^2-b)-(a^2b^2-ab)*(-3a)
2a^2(1/2ab^2-b)-(a^2b^2-ab)*(-3a
==a^3b^2-2a^2b+3a^3+3a^b
==4a^3b^2-a^2b
=a^2b(4ab-1)