1. Найдите произведение: a) $$4\frac{1}{2} \cdot 1\frac{1}{3}$$ б) $$\frac{9}{20} \cdot \frac{5}{12}$$ в) $$3\frac{5}{12} \cdot 1\frac{1}{2}$$

a) $$4\frac{1}{2} \cdot 1\frac{1}{3} = \frac{9}{2} \cdot \frac{4}{3} = \frac{9 \cdot 4}{2 \cdot 3} = \frac{36}{6} = 6$$

Ответ: 6

б) $$\frac{9}{20} \cdot \frac{5}{12} = \frac{9 \cdot 5}{20 \cdot 12} = \frac{45}{240} = \frac{3 \cdot 15}{3 \cdot 80} = \frac{15}{80} = \frac{5 \cdot 3}{5 \cdot 16} = \frac{3}{16}$$

Ответ: $$\frac{3}{16}$$

в) $$3\frac{5}{12} \cdot 1\frac{1}{2} = \frac{41}{12} \cdot \frac{3}{2} = \frac{41 \cdot 3}{12 \cdot 2} = \frac{123}{24} = \frac{41 \cdot 3}{8 \cdot 3} = \frac{41}{8} = 5\frac{1}{8}$$

Ответ: $$5\frac{1}{8}$$