§5. Обыкновенные дроби — Упражнения — 5.335 — стр. 58

\(\frac{2 \cdot 7}{6 \cdot 5} = \frac{14}{30} = \frac{7}{15}; \)

\(\frac{3 \cdot 5}{7 \cdot 3} = \frac{15}{21} = \frac{5}{7}; \)

\(\frac{9 \cdot 4}{4 \cdot 7} = \frac{36}{28} = \frac{9}{7}; \)

\(\frac{11 \cdot 5}{3 \cdot 11} = \frac{55}{33} = \frac{5}{3}\).

\(\frac{4 \cdot 3}{7 \cdot 8} = \frac{12}{56} = \frac{3}{14}; \)

\(\frac{2 \cdot 3}{3 \cdot 10} = \frac{6}{30} = \frac{1}{5}; \)

\(\frac{21 \cdot 6}{21 \cdot 7} = \frac{126}{147} = \frac{6}{7}; \)

\(\frac{3 \cdot 7}{21 \cdot 24} = \frac{21}{504} = \frac{1}{24}\).