\[\boxed{\text{1205.\ }\text{еуроки}\text{-}\text{ответы}\text{\ }\text{на}\text{\ }\text{пятёрку}}\]
\[a \neq 0\]
\[\textbf{а)}\ a^{12} = (a^{4})³\]
\[\textbf{б)}\ a^{12} = \left( a^{- 6} \right)^{- 2}\]