若1/x-1/y=2,求(3x-2xy-3y)/(x-2y-y)的值

来源：学生作业帮助网编辑：六六作业网时间：2024/12/25 16:01:23

若1/x-1/y=2,求(3x-2xy-3y)/(x-2y-y)的值若1/x-1/y=2,求(3x-2xy-3y)/(x-2y-y)的值若1/x-1/y=2,求(3x-2xy-3y)/(x-2y-y)

若1/x-1/y=2,求(3x-2xy-3y)/(x-2y-y)的值
若1/x-1/y=2,求(3x-2xy-3y)/(x-2y-y)的值

若1/x-1/y=2,求(3x-2xy-3y)/(x-2y-y)的值
1/x-1/y=(y-x)/xy=2
y-x=2xy
所以x-y=-2xy
原式=[3(x-y)-2xy]/[(x-y)-2xy]
=[3(-2xy)-2xy]/[(-2xy)-2xy]
=-8xy/(-4xy)
=2

1/x-1/y=(y-x)/xy=2
即：y-x=2xy
(3x-2xy-3y)/(x-2xy-y)
=[-3(y-x)-2xy]/[-(y-x)-2xy]
=(-6xy-2xy)/(-2xy-2xy)
=(-8xy)/(-2xy)
=4大哥。。介个。。你好像算错了吧。。 -2xy-2xy应该是-4xy吧。。1/x-1/y=(y-x)/xy...

全部展开

1/x-1/y=(y-x)/xy=2
即：y-x=2xy
(3x-2xy-3y)/(x-2xy-y)
=[-3(y-x)-2xy]/[-(y-x)-2xy]
=(-6xy-2xy)/(-2xy-2xy)
=(-8xy)/(-2xy)
=4

收起

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的值已知3/(x-y)=1/xy 求(-x-2xy+y)/ (2x+3xy-2y) 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)