已知1/x+1/y=5,则2x-5xy+2y/x+2xy+y

已知xy/x+y=1/2,则代数式3x-5xy+3y/-x+3xy-y= 已知x+y=-1,xy=-2,求代数式-5（x+y)+(x-y)+x(xy+y)的值 已知x+y=1,xy=1/5,则x^2y=xy^2 已知x+y=-1,xy=-2,求代数式-5（x+y)+(x-y)+2(xy+y)的值 已知X+Y=-1,xy=-2,求代数式-5(x+y)+(x-y)+(xy+y)的值 已知1/x+1/y=5 求2x-3xy+2y/3x+2xy+3y 已知1/x+1/y=5,求x+2xy+y/2x-3xy+2y的值 已知1/x+1/y=5 求2x-3xy+2y/x+2xy+y 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-x+xy+y/2x+7xy-2y 已知1/x-1/y=5,求分式y+xy-x/2x+7xy-2y的值. 已知1/X-1/y=5,求分式(y+xy-x)/(2x+7xy-2y)的值