上下裤碧卜同除以慧启xy原式=(2/y-3-2/x)胡穗/(1/y-2-1/x) =(-6-3)/(-3-2) =1.8
原厅森野式=2+xy/(x-2xy-y)=2+1/(1/春瞎y-2-1/x)=2-1/扮喊5=9/5=1.8
1/x-1/y=3通分化简得x-y=-3xy代入式子化简可得最后答案为9/5