已知1/x-1/y=3,求3x-5xy-3y/x-2xy-y的值.
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已知1/x-1/y=3,求3x-5xy-3y/x-2xy-y的值.已知1/x-1/y=3,求3x-5xy-3y/x-2xy-y的值.已知1/x-1/y=3,求3x-5xy-3y/x-2xy-y的值.1
已知1/x-1/y=3,求3x-5xy-3y/x-2xy-y的值.
已知1/x-1/y=3,求3x-5xy-3y/x-2xy-y的值.
已知1/x-1/y=3,求3x-5xy-3y/x-2xy-y的值.
1/x-1/y=(y-x)/xy=2
y-x=3xy
x-y=-3xy
原式=[3(x-y)-5xy]/[(x-y)-2xy]
=[3(-3xy)-5xy]/[(-3xy)-2xy]
=(-14xy)/(-5xy)
=14/5
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