Ответ:
\(2\frac{4}{7}=\frac{18}{7}\), \(1,2=\frac{6}{5}\).
\(\left(\frac{18}{7}-\frac{6}{5}\right)\cdot\frac{5}{6}=\left(\frac{90}{35}-\frac{42}{35}\right)\cdot\frac{5}{6}=\frac{48}{35}\cdot\frac{5}{6}=\frac{8}{7}\).
Ответ: \(\frac{8}{7}\).
\(2\frac{4}{7}=\frac{18}{7}\), \(1,2=\frac{6}{5}\).
\(\left(\frac{18}{7}-\frac{6}{5}\right)\cdot\frac{5}{6}=\left(\frac{90}{35}-\frac{42}{35}\right)\cdot\frac{5}{6}=\frac{48}{35}\cdot\frac{5}{6}=\frac{8}{7}\).
Ответ: \(\frac{8}{7}\).