正解は1と1/6！

\begin{eqnarray}\displaystyle \frac{5}{6}+\displaystyle \frac{1}{3}&=&\displaystyle \frac{5}{6}+\displaystyle \frac{2}{6}\\&=&\displaystyle \frac{7}{6}\\&=&1\displaystyle \frac{1}{6}\end{eqnarray}

もう1問！