已知1/x-1/y=3,求分式3x-xy+3y/x+xy+y的值.
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已知1/x-1/y=3,求分式3x-xy+3y/x+xy+y的值.
已知1/x-1/y=3,求分式3x-xy+3y/x+xy+y的值.
已知1/x-1/y=3,求分式3x-xy+3y/x+xy+y的值.
已知1/x-1/y=3,应该是1/x+1/y=3,[按原式得不出结果!]
如此,则3xy=x+y (3x-xy+3y)/(x+xy+y)=2
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