[4/（x^2-y^2)+（x+y)/(xy^2-x^2y)] / (x^2+xy-2y^2)/(x^2y+2xy^2) 其中,a=13,b=12

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[4/（x^2-y^2)+（x+y)/(xy^2-x^2y)]/(x^2+xy-2y^2)/(x^2y+2xy^2)其中,a=13,b=12[4/（x^2-y^2)+（x+y)/(xy^2-x^2y)

[4/（x^2-y^2)+（x+y)/(xy^2-x^2y)] / (x^2+xy-2y^2)/(x^2y+2xy^2) 其中,a=13,b=12
[4/（x^2-y^2)+（x+y)/(xy^2-x^2y)] / (x^2+xy-2y^2)/(x^2y+2xy^2) 其中,a=13,b=12

[4/（x^2-y^2)+（x+y)/(xy^2-x^2y)] / (x^2+xy-2y^2)/(x^2y+2xy^2) 其中,a=13,b=12
=[-(X-Y)/XY(X=Y)]*[XY/(X-Y)]=-1/(X+Y)=-1/25