4 17 9 63

9) $$\frac{4}{9} + \frac{17}{63} = \frac{4 \cdot 7}{9 \cdot 7} + \frac{17}{63} = \frac{28}{63} + \frac{17}{63} = \frac{28+17}{63} = \frac{45}{63} = \frac{5}{7}$$

Ответ: $$\frac{5}{7}$$