ab-[3a^2b-(2/3ab+4a^2b)]-(2ab+a^2b)
=ab-3a²b+2/3*ab+4a²b-2ab-a²b
=(1+2/3-2)ab+(-3+4-1)a²b
=-1/3*a
化简ab-[3a^2b-(2/3ab+4a^2b)]-(2ab+a^2b)
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