6x²y+2xy-8x²y-4x-5xy-2x²y²-6x²y=(6x²y-8x²y-6x²y)+(2xy-5xy)-4x-2x²y²=-8x²y-3xy-4x-2x²y²=-8×1²×2-3×1×2-4×1-2×1²×2²=-16-6-4-8=-34.
6x2y+2xy-8x2y-4x-5xy-2x2y2-6x2y化简,x=1,y=2,求值
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