若1/x-1/y等于3,求(2x+3xy-2y)/(x+2xy-y)的值我想了很久.

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若1/x-1/y等于3,求(2x+3xy-2y)/(x+2xy-y)的值我想了很久.若1/x-1/y等于3,求(2x+3xy-2y)/(x+2xy-y)的值我想了很久.若1/x-1/y等于3,求(2x

若1/x-1/y等于3,求(2x+3xy-2y)/(x+2xy-y)的值我想了很久.
若1/x-1/y等于3,求(2x+3xy-2y)/(x+2xy-y)的值
我想了很久.

若1/x-1/y等于3,求(2x+3xy-2y)/(x+2xy-y)的值我想了很久.
1/x-1/y=3
(y-x)/xy=3
y-x=3xy
(2x+3xy-2y)/(x+2xy-y)
=(-6xy+3xy)/(-3xy+2xy)
=3