Ответ:
\[\frac{11}{14}-\frac{1}{6}=\frac{33}{42}-\frac{7}{42}=\frac{26}{42}=\frac{13}{21}.\]
\[\frac{7}{39}\cdot\frac{13}{21}=\frac{1}{9}.\]
Ответ: \(\frac{1}{9}\).
\[\frac{11}{14}-\frac{1}{6}=\frac{33}{42}-\frac{7}{42}=\frac{26}{42}=\frac{13}{21}.\]
\[\frac{7}{39}\cdot\frac{13}{21}=\frac{1}{9}.\]
Ответ: \(\frac{1}{9}\).