化简3x^2y-[2xy^2-2（xy-3/2x^2y）+xy]+3xy^2
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3x^2y-[2xy^2-2（xy-3/2x^2y）+xy]+3xy^2
=3x^2y-[2xy^2-2xy+3x^2y+xy]+3xy^2
=3x^2y-[2xy^2-xy+3x^2y]+3xy^2
=3x^2y-2xy^2+xy-3x^2y+3xy^2
=3x^2y-3x^2y+3xy^2-2xy^2+xy
=xy^2+xy
=3x^2y-[2xy^2-2xy+3x^2y+xy]+3xy^2
=3x^2y-[2xy^2-xy+3x^2y]+3xy^2
=3x^2y-2xy^2+xy-3x^2y+3xy^2
=3x^2y-3x^2y+3xy^2-2xy^2+xy
=xy^2+xy
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