若1/x-1/y=1,求3y-xy-3x/x-xy-y的值.

来源：学生作业帮编辑：作业帮分类：数学作业时间：2024/11/08 00:38:35

1/x-1/y=1
xy/x-xy/y=xy
y-x=xy
∴3y-xy-3x/x-xy-y=3（y-x）-xy/(x-y)-xy
=3xy-xy/-xy-xy
=2xy/-2xy
=-1

若x-y=4,xy=1,求(-2xy+2x+3y)-(3xy+2y-2x)-(x+4y+xy)的值已知：x-y=1,xy=-2.求：(-2xy+2x+3y)-(3xy+2y-2x)-(x+4y+xy)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1/x+1/y=5,求3x+4xy+3y/x+3xy+y的值若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-2xy-y)的值若1/x-1/y=3,求5x+2xy-5y/x-4xy-y的值已知1/x+1/y=3,求分式(3x-3xy+3y)/(x+xy+y)的值已知1/x+1/y=3 求3x+xy+3y/x-xy=y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=3,求分式3x-xy+3y/x+xy+y的值.