\[1\frac{3}{14} \cdot ( - 2,5) = \frac{17}{14} \cdot \left( - \frac{5}{2} \right) =\]
\[= - \frac{17 \cdot 5}{14 \cdot 2} = - \frac{85}{28} = - 3\frac{1}{28}\]