Восстанови запись
\dfrac{1}{5} \, \cdot = \dfrac{1}{10}.
\dfrac{5}{6} \, \cdot = \dfrac{5}{18}.
\dfrac{7}{9} \, \cdot = 1.
\dfrac{2}{7} \, \cdot = \dfrac{4}{49}.
\dfrac{4}{5} \, \cdot = \dfrac{8}{15}.
\cdot \, \dfrac{10}{11} = 1.