已知5x^2-3xy+1/2y^2-2x+1/2y+1/4=0 求x,y的值

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已知xy/x+y=1/2,则代数式3x-5xy+3y/-x+3xy-y= 【数学】已知 1/x-1/y=3 求 5x-xy-5y / x-2xy-y=?已知 1/x=1/y 求 2x-3xy-2y / x-2xy-y=? 已知1/x+1/y=5,求x+y+3xy/2x-4xy+2y的值,已知1/x+1/y=5,x+y+3xy/2x-4xy+2y的值, 已知1/x+1/y=5 求2x-3xy+2y/3x+2xy+3y 已知1/x+1/y=5 求2x-3xy+2y/x+2xy+y 已知1/x-1/y=2,求x-y-5xy/2x-2y+3xy 已知1/x-1/y=5,则2x+3xy-2y/y+2xy-x 已知1/x+1/y=5,求x+2xy+y/2x-3xy+2y的值如题. 已知:1/X+1/Y=5,求 2x-3xy+2y/x+2xy+y的值, 已知1/x-1/y=5,求分式2x+5xy-2y/3x-xy-3y 已知1/x-1/y=2,求5x+3xy-5y/x-2xy-y 已知1/x=3+1/y,则(2x-5xy-2y)/(y+3xy-x)=_______. 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)=? 已知1/x+1/y=1/2,求代数式3x-5xy+3y/-x+3xy-y 已知1/x-1/y=3,求5x+3xy-5y/x-2xy-y的值 已知1/x-1/y=3,求x-2xy-y/5x+3xy-5y的值 已知1/x-1/y=3,求5x+3xy-5y/x-2xy-y的值.