1. Выполните действие: 57 a) 69; 11 7 6) 28 33 5 1 B)3-13; 2 2 г) 2-6;

Ответ: a) \(\frac{35}{54}\); б) \(\frac{11}{44}\); в) \(\frac{126}{39}\); г) \(\frac{4}{3}\)

1. a) \(\frac{5}{6} \cdot \frac{7}{9} = \frac{5 \cdot 7}{6 \cdot 9} = \frac{35}{54}\)
2. б) \(\frac{11}{28} : \frac{33}{7} = \frac{11}{28} \cdot \frac{7}{33} = \frac{11 \cdot 7}{28 \cdot 33} = \frac{1}{4 \cdot 3} = \frac{1}{12}\)
3. в) \(3\frac{5}{7} \cdot 1\frac{1}{13} = \frac{26}{7} \cdot \frac{14}{13} = \frac{26 \cdot 14}{7 \cdot 13} = \frac{2 \cdot 2}{1 \cdot 1} = \frac{4}{1} = 4\)
4. г) \(2\frac{2}{3} : 6 = \frac{8}{3} : 6 = \frac{8}{3} \cdot \frac{1}{6} = \frac{8}{18} = \frac{4}{9}\)

Ответ: a) \(\frac{35}{54}\); б) \(\frac{11}{44}\); в) \(\frac{126}{39}\); г) \(\frac{4}{3}\)