§ Задание 79
\[\boxed{\mathbf{3.79}}\]

\[7\ :x = y\ :8\]
\[xy = 7 \cdot 8\]
\[x = 14;\ \ y = 4;\]
\[x = 28;\ \ y = 2;\]
\[x = 10;\ y = 5,6.\]
\[\boxed{\mathbf{3.79}}\]

\[7\ :x = y\ :8\]
\[xy = 7 \cdot 8\]
\[x = 14;\ \ y = 4;\]
\[x = 28;\ \ y = 2;\]
\[x = 10;\ y = 5,6.\]