Вариант А1. 1. Вычислите: a) $$rac{2}{9} \cdot \frac{3}{8}$$ b) $$rac{3}{7} \cdot 21$$ v) $$3\frac{1}{5} \cdot \frac{15}{24}$$

a) $$rac{2}{9} \cdot \frac{3}{8} = \frac{2 \cdot 3}{9 \cdot 8} = \frac{6}{72} = \frac{1}{12}$$ б) $$rac{3}{7} \cdot 21 = \frac{3 \cdot 21}{7} = \frac{63}{7} = 9$$ в) $$3\frac{1}{5} \cdot \frac{15}{24} = \frac{16}{5} \cdot \frac{15}{24} = \frac{16 \cdot 15}{5 \cdot 24} = \frac{240}{120} = 2$$ Ответ: a) $$rac{1}{12}$$ б) $$9$$ в) $$2$$