\[\boxed{\mathbf{2.}\mathbf{367}}\]
\[1)\ 178,87 - (b - 13,4) =\]
\[= 174,77\]
\[b - 13,4 = 178,87 - 174,77\]
\[b - 13,4 = 4,1\]
\[b = 4,1 + 13,4\]
\[b = 17,5.\]
\[Ответ:b = 17,5.\]
\[2)\ 243,82 - (17,1 - c) = 231,32\]
\[17,1 - c = 243,82 - 231,32\]
\[17,1 - c = 12,5\]
\[c = 17,1 - 12,5\]
\[c = 4,6\]
\[Ответ:c = 4,6.\]