\[6\frac{8^{\backslash 6}}{15} + 4\frac{5^{\backslash 5}}{18} - 3,6 =\]
\[= 10\ \frac{48 + 25}{90} - 3\frac{6^{\backslash 9}}{10} =\]
\[= 10\frac{73}{90} - 3\frac{54}{90} = 7\frac{19}{90}\]