13. Выполните действия: 1) 5/27 · 9/15; 2) 8/39 · 1 10/16; 3) 1 4/28 · 14/42; 4) 3 1/4 · 1 9/13; 5) 16 · 2 2/3 · 2 1/4; 6) 2 4/5 · 3 4/12 · 2.

1. \(\frac{5}{27}\cdot\frac{9}{15}=\frac{5\cdot9}{27\cdot15}=\frac{1}{9}\).
2. \(\frac{8}{39}\cdot1\frac{10}{16}=\frac{8}{39}\cdot\frac{26}{16}=\frac{1}{3}\).
3. \(1\frac{4}{28}\cdot\frac{14}{42}=\frac{8}{7}\cdot\frac{1}{3}=\frac{8}{21}\).
4. \(3\frac{1}{4}\cdot1\frac{9}{13}=\frac{13}{4}\cdot\frac{22}{13}=\frac{11}{2}=5\frac{1}{2}\).
5. \(16\cdot2\frac{2}{3}\cdot2\frac{1}{4}=16\cdot\frac{8}{3}\cdot\frac{9}{4}=96\).
6. \(2\frac{4}{5}\cdot3\frac{4}{12}\cdot2=\frac{14}{5}\cdot\frac{10}{3}\cdot2=\frac{56}{3}=18\frac{2}{3}\).

Ответ: 1) \(\frac{1}{9}\); 2) \(\frac{1}{3}\); 3) \(\frac{8}{21}\); 4) \(5\frac{1}{2}\); 5) \(96\); 6) \(18\frac{2}{3}\).