2. Выполните действия a) (1 5/17) × (7 - 2 4/11) б) (4,2:1,2 - 1,05) × 1,6

a) $$1 \frac{5}{17} \times (7 - 2 \frac{4}{11}) = \frac{22}{17} \times (7 - \frac{26}{11}) = \frac{22}{17} \times (\frac{77}{11} - \frac{26}{11}) = \frac{22}{17} \times \frac{51}{11} = \frac{22 \times 51}{17 \times 11} = \frac{2 \times 3}{1 \times 1} = 6$$

б) $$(4.2 : 1.2 - 1.05) \times 1.6 = (3.5 - 1.05) \times 1.6 = 2.45 \times 1.6 = 3.92$$