Question

X/x^2+y^2 - y(x-2)^2/x^4-x^4

Answer 1

Х/(х^2 + у^2) - у(х-у)/(х+у)(х^2+у^2) = х(х+у) - у(х-у)/(х+у)(х^2+у^2) =( х^2 + у^2)/(х+у)(х^2+у^2) = 1/(х+у) Гы