\[( - 1,56 - 1,24) \cdot \left( - 1\frac{5}{14} \right) =\]
\[= - 2,8 \cdot \left( - \frac{19}{14} \right) = \frac{28 \cdot 19}{10 \cdot 14} = \frac{2 \cdot 19}{10 \cdot 1} =\]
\[= \frac{1 \cdot 19}{5} = \frac{19}{5} = 3\frac{4}{5} = 3,8.\]