1) \(-48\frac{3}{4} = -\frac{48 \cdot 4 + 3}{4} = -\frac{195}{4}\)
2) \(-\frac{195}{4} : 3.9 = -\frac{195}{4} : \frac{39}{10} = -\frac{195}{4} \cdot \frac{10}{39} = -\frac{1950}{156} = -\frac{25}{2} = -12.5\)
3) \(8\frac{1}{5} = \frac{8 \cdot 5 + 1}{5} = \frac{41}{5} = 8.2\)
4) \(-12.5 + 8.2 = -4.3\)
5) \(-4.3 \cdot (-6.3) = 27.09\)
Ответ: 27.09