作业帮已知1/x-1/y=-3,则x+5xy-y/3x-2xy-3y=
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已知1/x-1/y=-3,则x+5xy-y/3x-2xy-3y=
已知1/x-1/y=-3,则x+5xy-y/3x-2xy-3y=
已知1/x-1/y=-3,则x+5xy-y/3x-2xy-3y=
(x+5xy-y)/(3x-2xy-3y)
分子分母同时除以xy,得：
=[(1/y-1/x)+5]/[3(1/y-1/x)-2]
=(3+5)/(3*3-2)
=8/7
已知xy/x+y=1/2,则代数式3x-5xy+3y/-x+3xy-y=
已知1/x-1/y=3,则(5x+xy-5y)/(x-xy-y) =9=
已知1/x-1/y=-3,则x+5xy-y/3x-2xy-3y=
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