\[1)\ 2\frac{1^{\backslash 7}}{8} - \frac{39}{56} = 2\frac{7}{56} - \frac{39}{56} =\]
\[= 1\frac{63}{56} - \frac{39}{56} = 1\frac{24}{56} = 1\frac{3}{7}\ (м) -\]
\[другая\ сторона.\]
\[2)\ 2\frac{1}{8} \cdot 1\frac{3}{7} = \frac{17 \cdot 10}{8 \cdot 7} = \frac{85}{28} =\]
\[= 3\frac{1}{28}\ (м^{2}) - площадь.\]
\[Ответ:3\frac{1}{28}м^{2}.\]