2xy-xz6x^2+9x4x^2-9x^2-4x+4x^2-16y^29x^2-6x+12x^2y-8xy+8y3x(a-b)-2y(b-a)a^2(y-3)+(3-y)x^2(x-y)-(x-y)4xy-4x^2y-y(3a+2)^2-(a-6)^2x^4-8x^2+16我已经提高悬赏分
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