\[\boxed{\mathbf{501.}\mathbf{\ }}\]
\[1)\ (2,6 \cdot 1,34 - 2,404)\ :4,5 =\]
\[= 0,24\]
\[3,484 - 2,404 = 1,08\]
\[1,08\ :4,5 = 108\ :450 = 0,24\]
\[2)\ (55,08\ :1,8 - 4,056\ :0,52) \cdot 6,5 =\]
\[= 36,48\]
\[55,08\ :1,8 = 5508\ :180 = 30,6\]
\[4,056\ :0,52 = 4056\ :520 = 7,8\]
\[30,6 - 7,8 = 22,8\]