已知1/x-1/y=3,求分式(2x-14xy-2y)/(x-2xy-y)的值…………
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已知1/x-1/y=3,求分式(2x-14xy-2y)/(x-2xy-y)的值…………
已知1/x-1/y=3,求分式(2x-14xy-2y)/(x-2xy-y)的值…………
已知1/x-1/y=3,求分式(2x-14xy-2y)/(x-2xy-y)的值…………
由已知得:x-y=-3xy
∴(2x-14xy-2y)/(x-2xy-y)
=[2(x-y)-14xy]/[(x-y)-2xy]
=[-6xy-14xy]/[-3xy-2xy]
=(-20xy)/(-5xy)
=4
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