若1/x-1/y=2,求3x-2xy-3y/x-2xy-y的值【要过程】另一题：已知3x-y=0求（1+2y平方/x平方-y平方）除以（1+2y/x-y)【过程要详细】

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=4,xy=1,求(-2xy+2x+3y)-(3xy+2y-2x)-(x+4y+xy)的值 已知3/(x-y)=1/xy 求(-x-2xy+y)/ (2x+3xy-2y) 若1/x-1/y=1/3,求(2x+3xy-2y)/(x-3xy-y) 若1/x-1/y=3,求(2x+3xy-2y)/(x-2xy-y)的值 若1/x -1/y =3,求(2x+3xy-2y)/(x-y-2xy) 若1/X—1/Y=2,求3X-2XY-3Y/X-2XY-Y 若1/x-1/y=3,求（2x-3xy-2y)/(x-2xy-y)的值 若(1/x )-(1/y)=3,求(3x+4xy-3y)/(x-2xy-y)的值. 若1/X-1/Y=2,求3X+XY+3Y/X-XY-Y的值 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 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 若（x+1)^2+|y-2|=0,求3x^2-[5xy-(x^2y-3xy)+4x^2y-8xy]的值 已知x(x-1)-(x²-y)=-3,求(x²y+xy²)÷xy-2y 已知x y=1,xy=-3,求2xy-4x 4(y-2(xy-x)) 已知x-y=3,xy=1,求（-2x+2x+3y)-(3xy+2y-2x)-(x+4y+xy)