\[\boxed{\mathbf{546\ (546).}\mathbf{\ }Еуроки\ - \ ДЗ\ без\ мороки}\]
\[\left( 0,5\ :1,25 + 1,4 \cdot \frac{7}{11} - \frac{3}{11} \right) \cdot 4\frac{1}{8} =\]
\[= \left( \frac{5}{10}\ :\frac{125}{100} + \frac{14}{10} \cdot \frac{7}{11} - \frac{3}{11} \right) \cdot \frac{33}{8} =\]
\[\boxed{\mathbf{5}\mathbf{46}}\]
\[1)\ \frac{6}{13} - 0,28 \approx 0,46 - 0,28 =\]
\[= 0,18\]
\[2)\ 12\frac{10}{19} - 4,54 - 5\frac{1}{6} \approx\]
\[\approx 12,53 - 4,54 - 5,17 = 2,82\]