[x/(x-y)]·[y²/(x+y)]-[x^4y/(x^4-y^4)]÷[x²/(x²+y²)]=
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[x/(x-y)]·[y²/(x+y)]-[x^4y/(x^4-y^4)]÷[x²/(x²+y²)]=
[x/(x-y)]·[y²/(x+y)]-[x^4y/(x^4-y^4)]÷[x²/(x²+y²)]=
[x/(x-y)]·[y²/(x+y)]-[x^4y/(x^4-y^4)]÷[x²/(x²+y²)]=