Выполните действия: 9/10-(3/5+1/6)+2/3.

\[\frac{9}{10} - \left( \frac{3}{5} + \frac{1}{6} \right) + \frac{2}{3} =\]

\[= \frac{9^{\backslash 3}}{10} - \frac{3^{\backslash 6}}{5} - \frac{1^{\backslash 5}}{6} + \frac{2^{\backslash 10}}{3} =\]

\[= \frac{27 - 18 - 5 + 20}{30} = \frac{24}{30} = \frac{4}{5}.\]