[2x(x^2y-Xy)+Xy(xy-x^2)]÷x^2y,其中x =2012,y=2013

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[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

① 先化简,再求值.【2x（xy-xy）+xy（xy-x）】÷xy,其中x=2013,y=2012 （xy-x^2)乘以(xy)/(x-y) （x+2y-3xy)-(-2x-y+xy),其中x+y=1/2,xy=-1/2 （x＋2y-3xy）-（-2x-y+xy）,其中x+y=,xy=-,求值. 先化简在求值[2x(x^2y-xy^2)+xy(xy-x^2)]÷(x^2y),其中x=2008,y=2007 (x^2-xy)y÷y-x/xy怎么做? （x^2+xy/x-y)/（xy/x-y)计算先化简再求值：xy^3÷(-xy)+(x+2y)(x-2y),其中x=根号2,y=1 （-3x^y+2xy)-( )=4x^+xy x-y/x²÷x²-2xy+y²/xy*（xy-x²）（x+2y-3y)- (-2x-y+xy ) 其中x+y=0.5 xy等于-0.5 (x+2y-3xy+2x+y-xy)-(-2-y+xy),其中x+y=2分之1,xy=-2分之1