\[\boxed{\mathbf{6.116}}\]
\[1)\ \frac{3\frac{4}{5} \cdot \frac{5,5}{5,7} + 2\frac{2}{3}\ :( - 4)}{(8 - 2,9)\ :17} =\]
\[= \frac{\frac{19}{5} \cdot \frac{5,5}{5,7} - \frac{8}{3} \cdot \frac{1}{4}}{5,1\ :17} = \frac{\frac{11}{3} - \frac{2}{3}}{0,3} =\]
\[= \frac{3}{0,3} = \frac{30}{3} = 10\]
\[2)\ \frac{6\frac{1}{4}\ :5 + \frac{0,7}{7,6} \cdot \left( - 2\frac{5}{7} \right)}{(9,7 - 4,8)\ :49} =\]
\[= \frac{\frac{25}{4} \cdot \frac{1}{5} - \frac{0,7}{7,6} \cdot \frac{19}{7}}{4,9\ :49} = \frac{\frac{5}{4} - \frac{1}{4}}{0,1} =\]
\[= \frac{1}{0,1} = \frac{10}{1} = 10\]