Решение:
- \(1\frac{5}{17} \cdot (7-2\frac{4}{11}) = \frac{22}{17} \cdot (7 - \frac{26}{11}) = \frac{22}{17} \cdot (\frac{77-26}{11}) = \frac{22}{17} \cdot \frac{51}{11} = \frac{2 \cdot 3}{1} = 6\)
- \((6,3:1,4-2,05):1,8 = (\frac{63}{14} - 2.05):1.8 = (4.5 - 2.05):1.8 = 2.45:1.8 = \frac{245}{180} = \frac{49}{36}\)
Ответ: а) 6, б) \(\frac{49}{36}\).