-3m(a^2b)^2-[-2/3m^2(ab)^3]等于多少..

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-3m(a^2b)^2-[-2/3m^2(ab)^3]等于多少..

-3m(a^2b)^2-[-2/3m^2(ab)^3]
=-3ma^4b^2+2/3m^2a^3b^3
=ma^2b^2(2/3mab-3a^2)