[2x(x^2y-Xy)+Xy(xy-x^2)]÷x^2y,
=【2x^3y-2x^2y-x^2y^2-x^3y】÷x^2y
=[x^3y-2x^2y-x^2y^2]÷x^2y
=x-2-y
=x-y-2
=2012-2013-2
=-1-2
=-3