Правый столбец: 5/7 · 21/15 : 9/24 =; 4/5 : 8/10 : 20/2 =; 6/7 · 3/9 · 28/30 =; 40/50 : 20/5 · 3/4 =; 17/20 · 10/34 : 5/2 =; 15/20 : 150/200 : 2/3 =; 14/63 · 18/28 · 2/6 =; 77/25 : 11/13 · 65/7 =; 81/90 · 2/3 : 18/20 =; 42/60 : 7/12 : 3/21 =.

1. \(\frac{5}{7}\cdot\frac{21}{15}:\frac{9}{24}=1:\frac{3}{8}=\frac{8}{3}\).
2. \(\frac{4}{5}:\frac{8}{10}:\frac{20}{2}=\frac{1}{10}\).
3. \(\frac{6}{7}\cdot\frac{3}{9}\cdot\frac{28}{30}=\frac{4}{15}\).
4. \(\frac{40}{50}:\frac{20}{5}\cdot\frac{3}{4}=\frac{3}{20}\).
5. \(\frac{17}{20}\cdot\frac{10}{34}:\frac{5}{2}=\frac{1}{10}\).
6. \(\frac{15}{20}:\frac{150}{200}:\frac{2}{3}=\frac{3}{2}\).
7. \(\frac{14}{63}\cdot\frac{18}{28}\cdot\frac{2}{6}=\frac{1}{21}\).
8. \(\frac{77}{25}:\frac{11}{13}\cdot\frac{65}{7}=\frac{169}{5}\).
9. \(\frac{81}{90}\cdot\frac{2}{3}:\frac{18}{20}=\frac{2}{3}\).
10. \(\frac{42}{60}:\frac{7}{12}:\frac{3}{21}=\frac{42}{5}\).

Ответ: 8/3; 1/10; 4/15; 3/20; 1/10; 3/2; 1/21; 169/5; 2/3; 42/5.