已知1/x-1/y=3,则分式3x-3xy-y/x-2xy-y的值为多少
人气:332 ℃ 时间:2019-12-19 13:35:06
解答
由1/x-1/y=3,得,
(y-x)/xy=3,
y-x=3xy
x-y=-3xy,
代人,得,
(x-3xy-y)/(x-2xy-y)
=(-3xy-3xy)/(-3xy-2xy)
=(-6xy)/(-5xy)
=6/5�㿴�����ˡ���3x-3xy-y/x-2xy-y�����������
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