化简求值:3x²y-[2xy-2(xy-3/2x²y)+xy],其中x=3,y=-1/3如题
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![化简求值:3x²y-[2xy-2(xy-3/2x²y)+xy],其中x=3,y=-1/3如题](/uploads/image/z/401927-23-7.jpg?t=%E5%8C%96%E7%AE%80%E6%B1%82%E5%80%BC%3A3x%26%23178%3By-%5B2xy-2%28xy-3%2F2x%26%23178%3By%29%2Bxy%5D%2C%E5%85%B6%E4%B8%ADx%3D3%2Cy%3D-1%2F3%E5%A6%82%E9%A2%98)
化简求值:3x²y-[2xy-2(xy-3/2x²y)+xy],其中x=3,y=-1/3如题
化简求值:3x²y-[2xy-2(xy-3/2x²y)+xy],其中x=3,y=-1/3
如题
化简求值:3x²y-[2xy-2(xy-3/2x²y)+xy],其中x=3,y=-1/3如题
3x²y-[2xy-2(xy-3/2x²y)+xy]
=3x²y-2xy+2(xy-3/2x²y)+xy
=3x²y-2xy+2xy-3x²y+xy
=xy
=3×(-1/3)
=-1
3x²y-[2xy-2(xy-3/2x²y)+xy]
= 3x²y - [2xy - 2xy + 3x²y + xy]
= 3x²y - (3x²y + xy)
= - xy
= 1