Ответ: \(\frac{3}{4}\)
\( \frac{39}{7} - \frac{20}{7} = \frac{39 - 20}{7} = \frac{19}{7} \)
\( \frac{19}{7} \cdot \frac{49}{76} = \frac{19 \cdot 49}{7 \cdot 76} \)
\( \frac{1 \cdot 7}{1 \cdot 4} = \frac{7}{4} \)
\( \frac{7}{4} = 1\frac{3}{4} \)
Ответ: \(\frac{3}{4}\)