问题标题:
3x^2y+{xy-[3x^2y-(4xy^2+1/2xy)]-(4x^2y+3/2xy)}
问题描述:

3x^2y+{xy-[3x^2y-(4xy^2+1/2xy)]-(4x^2y+3/2xy)}

李冬俊回答:
  3x^2y+{xy-[3x^2y-(4xy^2+1/2xy)]-(4x^2y+3/2xy)}   =3x²y+{xy-[3x²y-4xy²-1/2xy]-4x²y-3/2xy}   =3x²y+{xy-3x²y+4xy²+1/2xy-4x²y-3/2xy}   =3x²y+xy-3x²y+4xy²+1/2xy-4x²y-3/2xy   =4xy²-4x²y
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