原式=ab-2{ab-3a^2b+4ab^2+1/2ab-3a^2b}-3ab^2
=ab-2ab+3a^2b-4ab^2-1/2ab+2a^2b-3ab^2
=(3+2)a^2b+(-4-3)ab^2+(1-2-1/2)ab
=5a^2b-7ab^2-3/2a
化简ab－2{ab－[3a²b－(4ab²＋2/1ab)－3a²b]}－3ab²
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