5.560 Вычислите: 1.1.2.1.3.5. :;3) 17.9.; 4) 6.5.4 1) 2) ㅎ 148 14779 446

1. 1) \[\frac{1}{4} : \frac{1}{4} = 1\]
2. 2) \[\frac{2}{7} : \frac{2}{6} = \frac{2}{7} \cdot \frac{6}{2} = \frac{6}{7}\]
3. 3) \[\frac{1}{3} : \frac{5}{8} = \frac{1}{3} \cdot \frac{8}{5} = \frac{8}{15}\]
4. 4) \[\frac{6}{7} : \frac{5}{7} : \frac{4}{9} = \frac{6}{7} \cdot \frac{7}{5} \cdot \frac{9}{4} = \frac{6 \cdot 9}{5 \cdot 4} = \frac{54}{20} = \frac{27}{10} = 2.7\]

Ответ: 1) 1; 2) 6/7; 3) 8/15; 4) 2.7