Ответ:
Сократим \(39\) и \(13\): \(39:13=3\).
\[\frac{12}{13}\cdot\frac{39}{20}=\frac{12\cdot3}{20}=\frac{36}{20}=\frac{9}{5}=1\frac{4}{5}.\]
Ответ: \(1\frac{4}{5}\).
Сократим \(39\) и \(13\): \(39:13=3\).
\[\frac{12}{13}\cdot\frac{39}{20}=\frac{12\cdot3}{20}=\frac{36}{20}=\frac{9}{5}=1\frac{4}{5}.\]
Ответ: \(1\frac{4}{5}\).