1. Выполните умножение: 1) \(\frac{4}{5} \cdot \frac{15}{16}\); 2) \(3\frac{1}{3} \cdot 1\frac{2}{25}\); 3) \(\frac{5}{13} \cdot 39.\)

1) \(\frac{4}{5} \cdot \frac{15}{16} = \frac{4 \cdot 15}{5 \cdot 16} = \frac{60}{80} = \frac{3}{4}\)

2) \(3\frac{1}{3} \cdot 1\frac{2}{25} = \frac{10}{3} \cdot \frac{27}{25} = \frac{10 \cdot 27}{3 \cdot 25} = \frac{270}{75} = \frac{18}{5} = 3\frac{3}{5}\)

3) \(\frac{5}{13} \cdot 39 = \frac{5 \cdot 39}{13} = \frac{195}{13} = 15\)

Ответ: 1) \(\frac{3}{4}\); 2) \(3\frac{3}{5}\); 3) 15