6. Найдите произведение: 1) 4 · 4/21; 2) 6 · 7/18; 3) 5/14 · 28; 4) 5 3/5 · 3/7; 5) 2 2/15 · 1 9/16; 6) 1 7/8 · 1 1/15 · 1 7/16.

1. \(4\cdot\frac{4}{21}=\frac{16}{21}\).
2. \(6\cdot\frac{7}{18}=\frac{7}{3}=2\frac{1}{3}\).
3. \(\frac{5}{14}\cdot28=10\).
4. \(5\frac{3}{5}\cdot\frac{3}{7}=\frac{28}{5}\cdot\frac{3}{7}=\frac{12}{5}=2\frac{2}{5}\).
5. \(2\frac{2}{15}\cdot1\frac{9}{16}=\frac{32}{15}\cdot\frac{25}{16}=\frac{10}{3}=3\frac{1}{3}\).
6. \(1\frac{7}{8}\cdot1\frac{1}{15}\cdot1\frac{7}{16}=\frac{15}{8}\cdot\frac{16}{15}\cdot\frac{23}{16}=\frac{23}{8}=2\frac{7}{8}\).

Ответ: 1) \(\frac{16}{21}\); 2) \(2\frac{1}{3}\); 3) 10; 4) \(2\frac{2}{5}\); 5) \(3\frac{1}{3}\); 6) \(2\frac{7}{8}\).