Найдите произведение: 1) 6/11 · 4/7; 2) 7/20 · 10/21; 3) 8/9 · 27/32; 4) 23/28 · 49/46; 5) 34/86 · 43/51; 6) 7/18 · 90/77; 7) 63/64 · 48/91; 8) 19/100 · 5/38.

1. \(\frac{6}{11}\cdot\frac{4}{7}=\frac{24}{77}\).
2. \(\frac{7}{20}\cdot\frac{10}{21}=\frac{1}{6}\).
3. \(\frac{8}{9}\cdot\frac{27}{32}=\frac{3}{4}\).
4. \(\frac{23}{28}\cdot\frac{49}{46}=\frac{23}{24}\).
5. \(\frac{34}{86}\cdot\frac{43}{51}=\frac{1}{3}\).
6. \(\frac{7}{18}\cdot\frac{90}{77}=\frac{5}{11}\).
7. \(\frac{63}{64}\cdot\frac{48}{91}=\frac{9}{16}\).
8. \(\frac{19}{100}\cdot\frac{5}{38}=\frac{1}{40}\).

Ответ: 1) \(\frac{24}{77}\); 2) \(\frac{1}{6}\); 3) \(\frac{3}{4}\); 4) \(\frac{23}{24}\); 5) \(\frac{1}{3}\); 6) \(\frac{5}{11}\); 7) \(\frac{9}{16}\); 8) \(\frac{1}{40}\).