已知1/x-1/2y=1/3,求分式(2x+3xy-4y)/(x-3xy-2y)的值

已知1/x+1/y=3,求分式3x-2xy+3y/x+xy+y的值 已知,1/x+1/y=5.,求分式3x+xy+3y/x-2xy+y的值 解一道分式题已知1/x-1/y=3 求分式(4x-5xy-4y)/(3x-2xy-3y)的值. 已知x-y/xy=3,求分式2x+3xy-2y/x-2xy-y的值. 1/x+1/y=3.求分式3x-2xy+3y/x+xy+y的值 已知：x-y=1,xy=-2.求：(-2xy+2x+3y)-(3xy+2y-2x)-(x+4y+xy)的值 .已知:x-y=1,xy=-2.求:(-2xy+2 x+3y)-(3xy+2y-2x)-(x+4y+xy)的值 已知1/x-1/y=3,求分式(2x+3xy-2y)/(x-2xy-y) 已知1/x-1/2y=1/3,求分式(2x+3xy-4y)/(x-3xy-2y)的值 已知1/x+1/y=4,求分式4x+3xy+4y/-3x+2xy-3y的值 已知1/x-1/y=3,求分式(4x-5xy-4y)/（3x-2xy-3y）的值 已知1/x-1/y=4,求分式2x+3xy-2y/x-2xy-y的值