已知x分之1-y分之1=3求x-2xy-y分之2x-14xy-2y的值
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1/x- 1/y =3
x-y = -3xy
(2x-14xy-2y)/(x-2xy-y)
=(2x+(14/3)(x-y)-2y)/(x+(2/3)(x-y)-y)
=(6x+14(x-y)-6y)/(3x+2(x-y)-3y)
=(20x-20y)/(5x-5y)
=4
x-y = -3xy
(2x-14xy-2y)/(x-2xy-y)
=(2x+(14/3)(x-y)-2y)/(x+(2/3)(x-y)-y)
=(6x+14(x-y)-6y)/(3x+2(x-y)-3y)
=(20x-20y)/(5x-5y)
=4
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