10. Вычислите: \(1,8\cdot\left(\frac{5}{6}:(-0,7)\right)-1\frac{2}{5}:2,5\).

\[1,8=\frac{9}{5},\qquad -0,7=-\frac{7}{10},\qquad 1\frac{2}{5}=\frac{7}{5},\qquad 2,5=\frac{5}{2}.\]

\[1,8\cdot\left(\frac{5}{6}:(-0,7)\right)-1\frac{2}{5}:2,5=\frac{9}{5}\cdot\left(\frac{5}{6}\cdot\left(-\frac{10}{7}\right)\right)-\frac{7}{5}\cdot\frac{2}{5}.\]

\[=-\frac{15}{7}-\frac{14}{25}=-\frac{473}{175}=-2\frac{123}{175}.\]

Ответ: \(-\frac{473}{175}\).