1. Выполните действие:
a) $$\frac{11}{40} \cdot \frac{15}{22} = \frac{11 \cdot 15}{40 \cdot 22} = \frac{1 \cdot 3}{8 \cdot 2} = \frac{3}{16}$$
б) $$1 \frac{4}{35} \cdot 1 \frac{2}{13} = \frac{39}{35} \cdot \frac{15}{13} = \frac{39 \cdot 15}{35 \cdot 13} = \frac{3 \cdot 3}{7 \cdot 1} = \frac{9}{7} = 1 \frac{2}{7}$$
в) $$2 \frac{5}{11} \cdot 3 \frac{1}{8} = \frac{27}{11} \cdot \frac{25}{8} = \frac{27 \cdot 25}{11 \cdot 8} = \frac{675}{88} = 7 \frac{59}{88}$$
г) $$2 \frac{5}{24} \cdot 8 = \frac{53}{24} \cdot 8 = \frac{53 \cdot 8}{24} = \frac{53}{3} = 17 \frac{2}{3}$$
Ответ: a) $$\frac{3}{16}$$, б) $$1 \frac{2}{7}$$, в) $$7 \frac{59}{88}$$, г) $$17 \frac{2}{3}$$