已知1/2-1/3=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=-2,求3X-5XY-3Y/-X+3XY+Y的值 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的值, 已知xy^2=-2,求-xy（x^2y^5-xy^3-y)的值. 已知xy/x+y=2,求代数式3x-5xy+3y/-x+2xy-y的值 已知x-y=2xy,求代数式3x-5xy-3y/x+xy-y的值 已知xy=2(x+y),求(5x-xy+5y)/(3xy-x-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x/1-y/1等于3,求x-2xy-y/5x+3xy-5y的值 1.已知x+y=-4,xy=3,求5（2分之1xy+2y）+[6x-(2xy+y-3x)]的值