3x-2xy-8-2x+6xy-x²+6
=-x²+(-2+6)xy+(3-2)x+(-8+6)
=-x²+4xy+x-2
-x²+2xy-y²-3x²-2xy+2y²
=(-1-3)x²+(2-2)xy+(-1+2)y²
=-4x²+y²
3x-2xy-8-2x+6xy-x²+6、-x²+2xy-y²-3x²-2xy+
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