\[2,5\sqrt[5]{\frac{1}{32}} - \sqrt[3]{15\frac{5}{8}} =\]
\[= 2,5 \cdot \frac{1}{2} - \sqrt[3]{\frac{125}{8}} = \frac{5}{4} - \frac{5^{\backslash 2}}{2} =\]
\[= \frac{5 - 10}{4} = - \frac{5}{4} = - 1,25\]