13. $$\frac{31}{32} + 5 \cdot \frac{7}{32} =$$

$$\frac{31}{32} + 5 \cdot \frac{7}{32} = \frac{31}{32} + \frac{5 \cdot 7}{32} = \frac{31}{32} + \frac{35}{32} = \frac{31 + 35}{32} = \frac{66}{32} = \frac{33}{16} = 2 \frac{1}{16}$$ Ответ: $$\frac{33}{16} = 2 \frac{1}{16}$$