分子分母同除以xy,得(2/y -3 -2/x)/(1/y -2- 1/x)将条件代入,得(-16-3)/(-8-2)= 19/10有点乱,没打错吧?
1.如果1/x-1/y=8,试求2x-3xy-2y/x-2xy-y的值.
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