作业帮[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](/uploads/image/z/1808347-67-7.jpg?t=%5B4%2F%EF%BC%88x%5E2-y%5E2%29%2B%EF%BC%88x%2By%29%2F%28xy%5E2-x%5E2y%29%5D+%2F+%28x%5E2%2Bxy-2y%5E2%29%2F%28x%5E2y%2B2xy%5E2%29+%E5%85%B6%E4%B8%AD%2Ca%3D13%2Cb%3D12)
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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)] / (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