\[\sqrt[4]{7\frac{58}{81}} - \sqrt[3]{0,125} =\]
\[= \sqrt[4]{\frac{625}{81}} - 0,5 = \frac{5}{3} - 0,5 =\]
\[= \frac{5^{\backslash 2}}{3} - \frac{1^{\backslash 3}}{2} = \frac{7}{6}\]