\[\boxed{\mathbf{676\ (676)}\mathbf{.}\mathbf{\ }Еуроки\ - \ ДЗ\ без\ мороки}\]
\[2)\ \frac{2}{3}\ :\frac{2}{3} = \frac{2 \cdot 3}{3 \cdot 2} = 1\]
\[3)\ \frac{1}{2}\ :\frac{1}{3} = \frac{1 \cdot 3}{2 \cdot 1} = \frac{3}{2} = 1\frac{1}{2}\]