5 3 -- = 8 16

$$\frac{5}{8} - \frac{3}{16} = \frac{5 \cdot 2}{8 \cdot 2} - \frac{3}{16} = \frac{10}{16} - \frac{3}{16} = \frac{7}{16}$$

Ответ: $$\frac{7}{16}$$