\[y = \frac{x^{3}}{x^{5} - 3}\]
\[y( - x) = \frac{( - x)^{3}}{( - x)^{5} - 3} =\]
\[= \frac{- x^{3}}{- x^{5} - 3} = \frac{x^{3}}{x^{5} + 3}.\]
\[Ни\ четная,\ ни\ нечетная.\]