в) $$1\frac{5}{7} \cdot 1\frac{17}{18} = \frac{7+5}{7} \cdot \frac{18+17}{18} = \frac{12}{7} \cdot \frac{35}{18} = \frac{6 \cdot 2 \cdot 7 \cdot 5}{7 \cdot 6 \cdot 3} = \frac{10}{3} = 3\frac{1}{3}$$.
Ответ: $$3\frac{1}{3}$$