Ответ:
\[y = x^{3} - нечетная.\]

\[125 = ( - 5)^{3};\ \ \]
\[125 \neq - 125 \Longrightarrow A \notin y.\]
\[64 = 4^{3};\ \ \ \ \ 64 = 64 \Longrightarrow B \in y.\]
\[- 27 = ( - 3)^{3};\ \ \]
\[- 27 = - 27\ \Longrightarrow C \in y.\]
\[y = x^{3} - нечетная.\]

\[125 = ( - 5)^{3};\ \ \]
\[125 \neq - 125 \Longrightarrow A \notin y.\]
\[64 = 4^{3};\ \ \ \ \ 64 = 64 \Longrightarrow B \in y.\]
\[- 27 = ( - 3)^{3};\ \ \]
\[- 27 = - 27\ \Longrightarrow C \in y.\]