已知x分之1-y分之1等于3,则代数式x-2xy-y分之2x+3xy-2y的值是?
3个回答
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1/x-1/y=3
x-y=-3xy
(2x+3xy-2y)/(x-2xy-y)
=[2(x-y)+3xy]/(x-y-2xy)
=(-6xy+3xy)/(-3xy-2xy)
=-3xy/(-5xy)
=3/5
x-y=-3xy
(2x+3xy-2y)/(x-2xy-y)
=[2(x-y)+3xy]/(x-y-2xy)
=(-6xy+3xy)/(-3xy-2xy)
=-3xy/(-5xy)
=3/5
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展开全部
1/x-1/y=3
y-x=3xy
(2x+3xy-2y)/(x-2xy-y)
=(-6xy+3xy)/(-3xy-2xy)
=3/5
y-x=3xy
(2x+3xy-2y)/(x-2xy-y)
=(-6xy+3xy)/(-3xy-2xy)
=3/5
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已踩过<
评论
收起
你对这个回答的评价是?
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