Ответ:
Сократим общие множители: \(\frac{6\cdot15}{5\cdot12}=\frac{6}{12}\cdot\frac{15}{5}=\frac{1}{2}\cdot3=\frac{3}{2}\).
\(\frac{11\cdot9}{15\cdot22}=\frac{11}{22}\cdot\frac{9}{15}=\frac{1}{2}\cdot\frac{3}{5}=\frac{3}{10}\).
\(\frac{18\cdot21}{14\cdot36}=\frac{18}{36}\cdot\frac{21}{14}=\frac{1}{2}\cdot\frac{3}{2}=\frac{3}{4}\).
Сократим на 17: \(\frac{45\cdot17}{17\cdot35}=\frac{45}{35}=\frac{9}{7}\).
\(\frac{81\cdot12}{24\cdot45}=\frac{81}{45}\cdot\frac{12}{24}=\frac{9}{5}\cdot\frac{1}{2}=\frac{9}{10}\).
\(\frac{56\cdot16}{48\cdot49}=\frac{56}{49}\cdot\frac{16}{48}=\frac{8}{7}\cdot\frac{1}{3}=\frac{8}{21}\).
Ответ: 1) 3/2; 2) 3/10; 3) 3/4; 4) 9/7; 5) 9/10; 6) 8/21.
