6x2y+2xy-8x2y-4x-5xy-2x2y2-6x2y化简,x=1,y=2,求值

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6x2y+2xy-8x2y-4x-5xy-2x2y2-6x2y化简,x=1,y=2,求值 越长越胖1年前1: bockhan 共回答了13个问题 | 采纳率92.3%

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.

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