\[\boxed{\mathbf{2.466}}\]
\[\textbf{а)}\ \left( \frac{1}{6} + 0,5 + \frac{1}{8} \right)\ :3\frac{1}{6} =\]
\[= \left( \frac{1^{\backslash 4}}{6} + \frac{1^{\backslash 12}}{2} + \frac{1^{\backslash 3}}{8} \right)\ :\frac{19}{6} =\]
\[= \left( \frac{4}{24} + \frac{12}{24} + \frac{3}{24} \right) \cdot \frac{6}{19} =\]
\[= \frac{19}{24} \cdot \frac{6}{19} = \frac{1}{4}\]
\[\textbf{б)}\ 9\ :0,18 - 37\frac{1}{2} \cdot 0,64 =\]
\[= 50 - \frac{75}{2} \cdot \frac{64}{100} =\]
\[= 50 - \frac{75}{2} \cdot \frac{16}{25} = 50 - 3 \cdot 8 =\]
\[= 26\]
\[\textbf{в)}\ 12,5 \cdot 4 - 7\frac{7}{3}\ :11 + 4,8 \cdot 9\frac{1}{6} =\]
\[= 50 - \frac{28}{3} \cdot \frac{1}{11} + \frac{24}{5} \cdot \frac{55}{6} =\]
\[= 50 - \frac{28}{33} + 44 =\]
\[= 94 - \frac{28}{33} = 93\frac{5}{33}\]
\[\textbf{г)}\ \left( \left( 1\frac{1}{5} \right)^{2} - 1,08 \right)\ :0,03 =\]
\[= \left( \left( \frac{6}{5} \right)^{2} - 1,08 \right)\ :0,03 =\]
\[= \left( \frac{36}{25} - 1,08 \right)\ :0,03 =\]
\[= \left( \frac{144}{100} - 1,08 \right)\ :0,03 =\]
\[= (1,44 - 1,08)\ :0,03 =\]
\[= 0,36\ :0,03 = 36\ :3 = 12\]