б) 1 4/11 · 3 1/7 : 3 4/7 =

Преобразуем смешанные числа:

\(1\frac{4}{11}=\frac{15}{11}\), \(3\frac{1}{7}=\frac{22}{7}\), \(3\frac{4}{7}=\frac{25}{7}\).

\(\frac{15}{11}\cdot\frac{22}{7}:\frac{25}{7}=\frac{15}{11}\cdot\frac{22}{25}=\frac{6}{5}=1\frac{1}{5}\).

Ответ: \(1\frac{1}{5}\)