现规定│a b c d│=a-b+c-d,试化简.│xy-3x² -2xy-x² -2x²-3 -5+xy│

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现规定│abcd│=a-b+c-d,试化简.│xy-3x²-2xy-x²-2x²-3-5+xy│现规定│abcd│=a-b+c-d,试化简.│xy-3x²-2x

现规定│a b c d│=a-b+c-d,试化简.│xy-3x² -2xy-x² -2x²-3 -5+xy│
现规定│a b c d│=a-b+c-d,试化简.│xy-3x² -2xy-x² -2x²-3 -5+xy│

现规定│a b c d│=a-b+c-d,试化简.│xy-3x² -2xy-x² -2x²-3 -5+xy│
│xy-3x² -2xy-x² -2x²-3 -5+xy│
即a=xy-3x²
b=-2xy-x²
c=-2x²-3
d=-5+xy
所以│xy-3x² -2xy-x² -2x²-3 -5+xy│
=(xy-3x²)-(-2xy-x²)+(-2x²-3)-(-5+xy)
=xy-3x²+2xy+x²-2x²-3+5-xy
=-4x²+2xy+2

│xy-3x² -2xy-x² -2x²-3 -5+xy│
=(xy-3x^2)-(-2xy-z^2)+(-2x^2-3)-(-5+xy)
=xy-3x^2+2xy+x^2-2x^2-3+5-xy
=-4x^2+2xy+2