6. Выполните умножение. a) $$1\frac{3}{7} \cdot 1\frac{1}{4} = \frac{10}{7} \cdot \frac{5}{4} = \frac{10 \cdot 5}{7 \cdot 4} = \frac{50}{28} = 1\frac{22}{28} = 1\frac{11}{14}$$

а) $$1\frac{3}{7} \cdot 1\frac{1}{4} = \frac{\textbf{10}}{7} \cdot \frac{\textbf{5}}{4} = \frac{\textbf{10} \cdot \textbf{5}}{7 \cdot 4} = \frac{\textbf{50}}{28} = 1\frac{\textbf{22}}{28} = 1\frac{\textbf{11}}{14}$$

Ответ: $$1\frac{11}{14}$$