(x+y)·x²/(x²-y²)+y²/(y-x)
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(x+y)·x^2/(x^2-y^2)+y^2/(y-x)=(x+y)·x^2/((x-y)(x+y))+y^2/(y-x)=·x^2/(x-y)-y^2/(x-y)
=(x^2-y^2)/(x-y)=x+y
=(x^2-y^2)/(x-y)=x+y
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(x+y)·x²/(x²-y²)+y²/(y-x)=(x+y)·x²/(x²-y²)-y²/(x-y)=(x+y)·x²/(x²-y²)-y²(x+y)/[(x-y)(x+y)]
=(x+y)(x^2-y^2)/(x^2-y^2)=x+y
=(x+y)(x^2-y^2)/(x^2-y^2)=x+y
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x y
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