Ответ:
\(7\frac{2}{6}-3\frac{9}{10}=\frac{22}{3}-\frac{39}{10}=\frac{103}{30}\).
\(2\frac{1}{3}+1\frac{5}{9}=\frac{7}{3}+\frac{14}{9}=\frac{35}{9}\).
\(\frac{103}{30}:\frac{35}{9}\cdot\frac{25}{6}=\frac{103}{30}\cdot\frac{9}{35}\cdot\frac{25}{6}=\frac{103}{28}\).
Ответ: \(\frac{103}{28}\).
