\[ -3\frac{1}{4} + 1\frac{7}{8} = -3\frac{2}{8} + 1\frac{7}{8} = -(3\frac{2}{8} - 1\frac{7}{8}) = -(2\frac{10}{8} - 1\frac{7}{8}) = -1\frac{3}{8} \]
\[ 363,6 : (-120) = -3,03 \]
\[ -1\frac{3}{8} - (-3,03) = -1,375 + 3,03 = 1,655 \]
Ответ: 1,655