1) \(\frac{5}{8} \cdot \frac{4}{15} = \frac{5 \cdot 4}{8 \cdot 15} = \frac{20}{120} = \frac{1}{6}\)
Ответ: \(\frac{1}{6}\)
2) \(6 \frac{3}{4} \cdot 1 \frac{11}{45} = \frac{6 \cdot 4 + 3}{4} \cdot \frac{1 \cdot 45 + 11}{45} = \frac{27}{4} \cdot \frac{56}{45} = \frac{27 \cdot 56}{4 \cdot 45} = \frac{3 \cdot 14}{1 \cdot 5} = \frac{42}{5} = 8 \frac{2}{5}\)
Ответ: \(8 \frac{2}{5}\)
3) \(\frac{11}{18} \cdot 36 = \frac{11 \cdot 36}{18} = \frac{11 \cdot 2}{1} = 22\)
Ответ: 22