3xy²-[xy-2(xy-3/2x²y)+3xy²]+3xy²,其中x=3,y

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3xy²-[xy-2(xy-3/2x²y)+3xy²]+3xy²,其中x=3,y=-1/3 化简求值

原式=3xy²-(xy-2xy+3x²y+3xy²)+3xy²
=3xy²-(-xy+3x²y+3xy²)+3xy²
=3xy²+xy-3x²y-3xy²+3xy²
=xy
=3×(-1/3)
=-1

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