р) $$3\frac{7}{9} \cdot 1\frac{1}{17} = \frac{34}{9} \cdot \frac{18}{17} = \frac{34 \cdot 18}{9 \cdot 17} = \frac{2 \cdot 2}{1 \cdot 1} = \frac{4}{1} = 4$$
Ответ: 4