(1/X)-(1/Y)=3,求(2X+3XY-2Y)/(X-2XY-Y)

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(1/X)-(1/Y)=3,求(2X+3XY-2Y)/(X-2XY-Y)

(1/X)-(1/Y)=3,求(2X+3XY-2Y)/(X-2XY-Y)
(1/X)-(1/Y)=3,求(2X+3XY-2Y)/(X-2XY-Y)

(1/X)-(1/Y)=3,求(2X+3XY-2Y)/(X-2XY-Y)
(1/X)-(1/Y)=3
(y-x)/xy=3
y-x=3xy
x-y=-3xy
(2X+3XY-2Y)/(X-2XY-Y)
=[2(x-y)+3xy]/[(x-y)-2xy]
=(-6xy+3xy)/(-3xy-2xy)
=-3xy/-5xy
=3/5

3/5

1/x-1/y=3
(y-x)/(xy)=3
y-x=3xy
x-y=-3xy
(2x+3xy-2y)/(x-2xy-y)
=[2(x-y)+3xy]/[(x-y)-2xy]
=(-6xy+3xy)/(-3xy-2xy)
=(-3xy)/(-5xy)
=3/5

因为(1/X)-(1/Y)=3,
所以(Y-X)/(XY)=3,
所以Y-X=3XY,
所以X-Y=-3XY,
所以(2X+3XY-2Y)/(X-2XY-Y)
=[2(X-Y)+3XY]/[(X-Y)-2XY]
=[2*(-3XY)+3XY]/(-3XY-2XY)
=(-3XY)/(-5XY)
=3/5.