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

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

化简求值3x²y-[2xy²-2(xy-3/2x²y)+xy]+3xy² ,当x=3,y=-1/3
3x²y-[2xy²-2(xy-3/2x²y)+xy]+3xy²
=3x²y-2xy²+2xy-3x²y-xy+3xy²
=xy²+xy
=3x(-1/3)²-3x1/3
=3-1
=2
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