已知：（x+2)²+|x+y-2|=0,求3x²y+{-2x²y-[-2xy+(x²y-4x²）]-xy}

已知：（x+2)²+|x+y-2|=0,求3x²y+{-2x²y-[-2xy+(x²y-4x²）]-xy}
已知：（x+2)²+|x+y-2|=0,求3x²y+{-2x²y-[-2xy+(x²y-4x²）]-xy}

已知：（x+2)²+|x+y-2|=0,求3x²y+{-2x²y-[-2xy+(x²y-4x²）]-xy}

已知：（x+2)²+|x+y-2|=0,
x+2=0;
x=-2;
x+y-2=0;
y=2-x=4;
所以3x²y+{-2x²y-[-2xy+(x²y-4x²）]-xy}
=3x²y-2x²y+2xy-x²y+4x²-xy
=4x²+xy

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已知：（x+2)²+|x+y-2|=0,
x+2=0;
x=-2;
x+y-2=0;
y=2-x=4;
所以3x²y+{-2x²y-[-2xy+(x²y-4x²）]-xy}
=3x²y-2x²y+2xy-x²y+4x²-xy
=4x²+xy
=x(4x+y)
=-2(-2×4+4)
=-2×(-4)
=8;
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