分式的加减法x^2-y/x^2-y^2-x-y^2/y^2-x^2

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分式的加减法x^2-y/x^2-y^2-x-y^2/y^2-x^2

分式的加减法x^2-y/x^2-y^2-x-y^2/y^2-x^2
分式的加减法x^2-y/x^2-y^2-x-y^2/y^2-x^2

分式的加减法x^2-y/x^2-y^2-x-y^2/y^2-x^2
(x²-y)/(x²-y²)-(x-y²)/(y²-x²)
=(x²-y)/(x²-y²)+(x-y²)/(x²-y²)
=(x²-y+x-y²)/(x²-y²)
=[(x-y)(x+y)+(x-y)]/(x²-y²)
=(x-y)(x+y+1)/(x-y)(x+y)
=(x+y+1)/(x+y)