若x+y=3,xy=1,则(-5x+2)-(3xy+5y)等于多少

若x-y=4,xy=1,则(2x+y-2xy)-(3x+2y+xy)-(4xy+3y-5x)= 若xy/x+y=2,则3x-5xy+3y/-x+3xy-y=?/是分之 已知xy/x+y=1/2,则代数式3x-5xy+3y/-x+3xy-y= 若1/x+1/y=2,则(2x-xy+2y)÷(3x+5xy+3y) 若1/x-1/y=2,求3x-2xy-3y/x-xy-y的值3x-2xy-3y/x-xy-y 不好意思，是3x-2xy-3y/x-2xy-y 若x+y=-1,则x^4+5x^3y+x^2y+8x^2y^2+xy^2+5xy^3+y^4=( )若x+y=-1,则x^4+5x^3y+x^2y+8x^2y^2+xy^2+5xy^3+y^4=( ） 若x-y=1,xy=5,则x^2y-xy^2＝ 若实数x,y满足1/x-1/y=5,则分式3x-2xy-3y/x+xy-y的值等于? 若x/1-y/1=5,则x-2xy-y/2x+5xy-2y=? 若1/X-1/Y=3,则2X+XY-2Y/X-2XY-Y=? 已知1/x=3+1/y,则(2x-5xy-2y)/(y+3xy-x)=_______. 已知1/x-1/y=-3,则x+5xy-y/3x-2xy-3y= 已知2/X-1/Y=3,则(X-2Y-XY)/(5XY+6Y-3X)=? 已知2/x-1/y=3,则(2y-x+4xy)/(3x-6y-5xy)=? 若1/x-1/y=2,则（3x+xy-3y)/(x-xy-y）的值为? 若1/X-1/Y=3,求5X+2XY-5Y/X-4XY-Y 若1/x-1/y=3,求5x+2xy-5y/x-4xy-y的值 已知1/x-1/y=5,则2x+3xy-2y/y+2xy-x