Выполните действие. a) \(\frac{3}{7} \cdot \frac{2}{5}\) б) \(\frac{7}{13} \cdot \frac{39}{56}\) в) \(3\frac{1}{9} \cdot 2\frac{1}{7}\) г) \(2\frac{1}{7} \cdot 2\frac{4}{5}\) д) \(1\frac{1}{9} \cdot \frac{3}{10}\) е) \(\frac{4}{11} \cdot 4\frac{7}{12}\)

a) \(\frac{3}{7} \cdot \frac{2}{5} = \frac{3 \cdot 2}{7 \cdot 5} = \frac{6}{35}\) б) \(\frac{7}{13} \cdot \frac{39}{56} = \frac{7 \cdot 39}{13 \cdot 56} = \frac{273}{728} = \frac{3}{8}\) в) \(3\frac{1}{9} \cdot 2\frac{1}{7} = \frac{28}{9} \cdot \frac{15}{7} = \frac{28 \cdot 15}{9 \cdot 7} = \frac{420}{63} = \frac{20}{3} = 6\frac{2}{3}\) г) \(2\frac{1}{7} \cdot 2\frac{4}{5} = \frac{15}{7} \cdot \frac{14}{5} = \frac{15 \cdot 14}{7 \cdot 5} = \frac{210}{35} = 6\) д) \(1\frac{1}{9} \cdot \frac{3}{10} = \frac{10}{9} \cdot \frac{3}{10} = \frac{10 \cdot 3}{9 \cdot 10} = \frac{30}{90} = \frac{1}{3}\) е) \(\frac{4}{11} \cdot 4\frac{7}{12} = \frac{4}{11} \cdot \frac{55}{12} = \frac{4 \cdot 55}{11 \cdot 12} = \frac{220}{132} = \frac{5}{3} = 1\frac{2}{3}\)