6 1/2 * 1/39 =

$$6 \frac{1}{2} \cdot \frac{1}{39} = \frac{13}{2} \cdot \frac{1}{39} = \frac{13 \cdot 1}{2 \cdot 39} = \frac{13}{78} = \frac{1}{6}$$

Ответ: 1/6