12) \(4\frac{2}{3}\cdot2\frac{1}{5}=\)

\(4\frac{2}{3}=\frac{14}{3}\), \(2\frac{1}{5}=\frac{11}{5}\).

\(\frac{14}{3}\cdot\frac{11}{5}=\frac{154}{15}=10\frac{4}{15}\).

Ответ: \(10\frac{4}{15}\).