Вычислите: 17/33 · 11/34; 7/30 · 6/21; 4/12 · 18/20; 21/25 · 15/42; 14/24 · 16/21; 50/70 · 77/150; 23/45 · 9/46; 30/66 · 77/90; 26/32 · 12/13; 8/19 · 38/40.

1. \(\frac{17}{33}\cdot\frac{11}{34}=\frac{1}{3}\cdot\frac{1}{2}=\frac{1}{6}\).
2. \(\frac{7}{30}\cdot\frac{6}{21}=\frac{1}{5}\cdot\frac{1}{3}=\frac{1}{15}\).
3. \(\frac{4}{12}\cdot\frac{18}{20}=\frac{1}{3}\cdot\frac{9}{10}=\frac{3}{10}\).
4. \(\frac{21}{25}\cdot\frac{15}{42}=\frac{3}{5}\cdot\frac{1}{2}=\frac{3}{10}\).
5. \(\frac{14}{24}\cdot\frac{16}{21}=\frac{2}{3}\cdot\frac{2}{3}=\frac{4}{9}\).
6. \(\frac{50}{70}\cdot\frac{77}{150}=\frac{5}{7}\cdot\frac{77}{150}=\frac{11}{30}\).
7. \(\frac{23}{45}\cdot\frac{9}{46}=\frac{1}{5}\cdot\frac{1}{2}=\frac{1}{10}\).
8. \(\frac{30}{66}\cdot\frac{77}{90}=\frac{1}{3}\cdot\frac{7}{6}=\frac{7}{18}\).
9. \(\frac{26}{32}\cdot\frac{12}{13}=\frac{13}{16}\cdot\frac{12}{13}=\frac{3}{4}\).
10. \(\frac{8}{19}\cdot\frac{38}{40}=\frac{8}{40}\cdot 2=\frac{2}{5}\).

Ответ: \(\frac{1}{6};\ \frac{1}{15};\ \frac{3}{10};\ \frac{3}{10};\ \frac{4}{9};\ \frac{11}{30};\ \frac{1}{10};\ \frac{7}{18};\ \frac{3}{4};\ \frac{2}{5}\).