Решим примеры:
- A) $$1\frac{1}{4} \cdot 2\frac{2}{3} = \frac{5}{4} \cdot \frac{8}{3} = \frac{5 \cdot 8}{4 \cdot 3} = \frac{5 \cdot 2}{1 \cdot 3} = \frac{10}{3} = 3\frac{1}{3}$$
- Б) $$4\frac{1}{2}:1\frac{1}{8} = \frac{9}{2} : \frac{9}{8} = \frac{9}{2} \cdot \frac{8}{9} = \frac{9 \cdot 8}{2 \cdot 9} = \frac{1 \cdot 4}{1 \cdot 1} = 4$$
- В) $$3 \cdot 2\frac{3}{5} = 3 \cdot \frac{13}{5} = \frac{3 \cdot 13}{5} = \frac{39}{5} = 7\frac{4}{5}$$
- Г) $$6 : 1\frac{1}{2} = 6 : \frac{3}{2} = 6 \cdot \frac{2}{3} = \frac{6 \cdot 2}{3} = \frac{2 \cdot 2}{1} = 4$$
- Д) $$(3\frac{1}{3} : 2) \cdot 1\frac{1}{4} = (\frac{10}{3} : 2) \cdot \frac{5}{4} = (\frac{10}{3} : \frac{2}{1}) \cdot \frac{5}{4} = \frac{10}{3} \cdot \frac{1}{2} \cdot \frac{5}{4} = \frac{10 \cdot 1 \cdot 5}{3 \cdot 2 \cdot 4} = \frac{5 \cdot 1 \cdot 5}{3 \cdot 1 \cdot 4} = \frac{25}{12} = 2\frac{1}{12}$$
Ответ: A) $$3\frac{1}{3}$$, Б) 4, В) $$7\frac{4}{5}$$, Г) 4, Д) $$2\frac{1}{12}$$