\[\boxed{\text{243\ (243).}\text{\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]
\[1)\ 48\ :4 = 12\]
\[2^{48} = \left( 2^{4} \right)^{12}\]
\[2)\ 48\ :16 = 3\]
\[2^{48} = \left( 2^{16} \right)^{3}\]
\[3)\ 48\ :3 = 16\]
\[2^{48} = \left( 2^{3} \right)^{16} = 8^{16}\]
\[4)\ 48\ :6 = 8\]
\[2^{48} = \left( 2^{6} \right)^{8} = 64^{8}\ \]