1/x-1/y=4,求分式(3x+xy-3y)/(x-2xy-y)要明白一点的..呵呵

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1/x-1/y=4,求分式(3x+xy-3y)/(x-2xy-y)要明白一点的..呵呵1/x-1/y=4,求分式(3x+xy-3y)/(x-2xy-y)要明白一点的..呵呵1/x-1/y=4,求分式(

1/x-1/y=4,求分式(3x+xy-3y)/(x-2xy-y)要明白一点的..呵呵
1/x-1/y=4,求分式(3x+xy-3y)/(x-2xy-y)
要明白一点的..呵呵

1/x-1/y=4,求分式(3x+xy-3y)/(x-2xy-y)要明白一点的..呵呵
11/4