2.397 Найдите произведение: a) $$8 \frac{4}{15} \cdot 2$$; б) $$3 \frac{9}{14} \cdot 7$$; в) $$7 \frac{4}{27} \cdot 5$$; г) $$8 \cdot 2 \frac{1}{2}$$

a) $$8 \frac{4}{15} \cdot 2 = \frac{124}{15} \cdot 2 = \frac{248}{15} = 16 \frac{8}{15}$$

б) $$3 \frac{9}{14} \cdot 7 = \frac{51}{14} \cdot 7 = \frac{51}{2} = 25 \frac{1}{2}$$

в) $$7 \frac{4}{27} \cdot 5 = \frac{193}{27} \cdot 5 = \frac{965}{27} = 35 \frac{20}{27}$$

г) $$8 \cdot 2 \frac{1}{2} = 8 \cdot \frac{5}{2} = \frac{40}{2} = 20$$