\[\boxed{\text{57\ (57).}\text{\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]
Пояснение.
Решение.
\[\textbf{а)}\ 8,6 < 8,63 < 8,7\]
\[\textbf{б)}\ \frac{1}{8} < \frac{22}{168} < \frac{1}{7}\]
\[\frac{1^{\backslash 24}}{7} = \frac{24}{168};\ \ \ \ \ \ \ \ \ \ \frac{1^{\backslash 21}}{8} = \frac{21}{168}\ \]
\[\textbf{в)} - 3,7 < - 3,67 < - 3,6\]
\[\textbf{г)}\ \frac{3}{4} < \frac{19}{24} < \frac{5}{6}\]
\[\frac{3^{\backslash 6}}{4} = \frac{18}{24};\ \ \ \ \ \ \frac{5^{\backslash 4}}{6} = \frac{20}{24}\]