Вычислите: $\frac{15}{2,4}:\frac{3}{4}:\frac{7,7}{4,5} \cdot 2\frac{1}{7}$

Решим пошагово: 1. $\frac{15}{2,4} = \frac{15}{\frac{24}{10}} = \frac{150}{24} = \frac{25}{4}$ 2. $\frac{25}{4} : \frac{3}{4} = \frac{25}{4} \times \frac{4}{3} = \frac{25}{3}$ 3. $\frac{7,7}{4,5} = \frac{\frac{77}{10}}{\frac{45}{10}} = \frac{77}{45}$ 4. $2\frac{1}{7} = \frac{15}{7}$ 5. $\frac{77}{45} \cdot \frac{15}{7} = \frac{11}{3}$ 6. $\frac{25}{3} : \frac{11}{3} = \frac{25}{3} \times \frac{3}{11} = \frac{25}{11}$ Ответ: $\frac{25}{11}$