3x²-[1/2x²y-(2xy+2x²-x²y)-(2x²y+xy)],其中x=1,y=-2

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3x²-[1/2x²y-(2xy+2x²-x²y)-(2x²y+xy)],其中x=1,y=-23x²-[1/2x²y-(2xy+2

3x²-[1/2x²y-(2xy+2x²-x²y)-(2x²y+xy)],其中x=1,y=-2
3x²-[1/2x²y-(2xy+2x²-x²y)-(2x²y+xy)],其中x=1,y=-2

3x²-[1/2x²y-(2xy+2x²-x²y)-(2x²y+xy)],其中x=1,y=-2