60. Найдите произведение: 4 1) 7·37; 8 3) 13·26; 7 2)15·3; 37 4)8·9; 4 11 5) 4·212; 2 1 6) 1·15·17.

Решим по порядку:

1) \(7 \cdot \frac{4}{37} = \frac{7 \cdot 4}{37} = \frac{28}{37}\)

2) \(\frac{7}{15} \cdot 3 = \frac{7 \cdot 3}{15} = \frac{7}{5}\)

3) \(\frac{8}{13} \cdot 26 = \frac{8 \cdot 26}{13} = \frac{8 \cdot 2}{1} = 16\)

4) \(3 \frac{7}{8} \cdot \frac{3}{9} = \frac{31}{8} \cdot \frac{3}{9} = \frac{31 \cdot 3}{8 \cdot 9} = \frac{31}{8 \cdot 3} = \frac{31}{24}\)

5) \(4 \frac{4}{7} \cdot 2 \frac{11}{12} = \frac{32}{7} \cdot \frac{35}{12} = \frac{32 \cdot 35}{7 \cdot 12} = \frac{8 \cdot 5}{1 \cdot 3} = \frac{40}{3}\)

6) \(1 \frac{2}{13} \cdot 15 \cdot 1 \frac{1}{7} = \frac{15}{13} \cdot 15 \cdot \frac{8}{7} = \frac{15 \cdot 15 \cdot 8}{13 \cdot 7} = \frac{1800}{91}\)