1. Выполните действие: 5.7 a) 98 5 4 B) 56⋅27 4 16 б) 27⋅16; 5.24 г) 112 4 16 д) 9:45 18 e) 19: 6.

Ответ: 35/72; 10/21; 2/15; 1/5; 3/19

1. a) \(\frac{5}{9} \cdot \frac{7}{8}\) = \(\frac{5 \cdot 7}{9 \cdot 8}\) = \(\frac{35}{72}\)
2. б) \(\frac{4}{27} \cdot \frac{9}{16}\) = \(\frac{4 \cdot 9}{27 \cdot 16}\) = \(\frac{1}{3 \cdot 4}\) = \(\frac{1}{12}\)
3. в) \(5\frac{5}{6} \cdot 2\frac{4}{7}\) = \(\frac{35}{6} \cdot \frac{18}{7}\) = \(\frac{35 \cdot 18}{6 \cdot 7}\) = \(\frac{5 \cdot 3}{1 \cdot 1}\) = 15
4. г) \(1\frac{5}{12} \cdot 24\) = \(\frac{17}{12} \cdot 24\) = \(\frac{17 \cdot 24}{12}\) = 17 \(\cdot\) 2 = 34
5. д) \(\frac{4}{9} : \frac{16}{45}\) = \(\frac{4}{9} \cdot \frac{45}{16}\) = \(\frac{4 \cdot 45}{9 \cdot 16}\) = \(\frac{1 \cdot 5}{1 \cdot 4}\) = \(\frac{5}{4}\) = 1,25
6. e) \(\frac{18}{19} : 6\) = \(\frac{18}{19} \cdot \frac{1}{6}\) = \(\frac{18 \cdot 1}{19 \cdot 6}\) = \(\frac{3 \cdot 1}{19 \cdot 1}\) = \(\frac{3}{19}\)

Ответ: 35/72; 10/21; 2/15; 1/5; 3/19