Ответ:

\(2\frac{4}{7}=\frac{18}{7}\), \(1,2=\frac{6}{5}\), \(5\frac{5}{6}=\frac{35}{6}\).

\(\frac{18}{7}-\frac{6}{5}=\frac{48}{35}\).

\(\frac{48}{35}\cdot\frac{35}{6}=8\).

Ответ: 8.