[tex]a)~~2^5~\bigcirc~(-2)^5\\
2 \ \textgreater \ 0\ \textgreater \ -2 ~\text{ si exponenti impari egali}\\
\Longrightarrow \boxed{2^5~ \ \textgreater \ ~(-2)^5}\\\\\\
b)~~6^2~\bigcirc~(-3)^4\\
(-3)^4=3^4=\Big(3^2\Big)^2=9^2\\
6^2\ \textless \ 9^2\\
\Longrightarrow \boxed{6^2\ \textless \ (-3)^4}\\\\\\
c)~~(-3)^4~\bigcirc~(-9)^2\\
(-3)^4=3^4\\
(-9)^2=9^2=(3^2)^2=3^4\\
3^4=3^4\\
\Longrightarrow \boxed{(-3)^4=(-9)^2}\\\\\\
d)~~14^5~\bigcirc~(-2)^5\\
14 \ \textgreater \ 0\ \textgreater \ -2 ~\text{ si exponenti impari egali}\\
\Longrightarrow \boxed{14^5~ \ \textgreater \ ~(-2)^5}[/tex]