Приведите к несократимой дроби: a) (2*7)/(6*5), (3*5)/(7*3), (9*4)/(4*7), (11*5)/(3*11) б) (4*3)/(7*8)

a) * \( \frac{2 \cdot 7}{6 \cdot 5} = \frac{14}{30} = \frac{7}{15} \) * \( \frac{3 \cdot 5}{7 \cdot 3} = \frac{15}{21} = \frac{5}{7} \) * \( \frac{9 \cdot 4}{4 \cdot 7} = \frac{36}{28} = \frac{9}{7} \) * \( \frac{11 \cdot 5}{3 \cdot 11} = \frac{55}{33} = \frac{5}{3} \) б) * \( \frac{4 \cdot 3}{7 \cdot 8} = \frac{12}{56} = \frac{3}{14} \)