(3x^2y-xy^2+二分之一xy)÷(-二分之一xy)

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(3x^2y-xy^2+二分之一xy)÷(-二分之一xy)

(3x^2y-xy^2+二分之一xy)÷(-二分之一xy)
(3x^2y-xy^2+二分之一xy)÷(-二分之一xy)

(3x^2y-xy^2+二分之一xy)÷(-二分之一xy)
(3x²y-xy²+xy/2)÷(-xy/2)
=-2(3x-y+1/2)
=-6x+2y-1

??

(3x^2y-xy^2+二分之一xy)÷(-二分之一xy)
=-6x+2y-1

∵(2x^3-3x^2y-xy^2)+(-x^3+2x^2y+y^3)-(x^3-x^2y-xy^2) =2x -3x y-xy -x +2x y+y -x +x y+xy =y ∵(2x^3-3x^2y