1/x-1/y=3,求2x+3xy-2y/x-y

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1/x-1/y=3,求2x+3xy-2y/x-y
1/x-1/y=3,求2x+3xy-2y/x-y

1/x-1/y=3,求2x+3xy-2y/x-y
∵1/x-1/y=3
∴y-x=3xy
2x+3xy-2y/x-y
=2(x-y)+3xy/x-y
=-6xy+3xy/-3xy
=1