\[ 2 \frac{3}{4} - \frac{3}{4} = \frac{11}{4} - \frac{3}{4} = \frac{8}{4} = 2 \]
\[ 1 \frac{1}{7} : \frac{5}{7} = \frac{8}{7} : \frac{5}{7} = \frac{8}{7} \times \frac{7}{5} = \frac{8}{5} \]
\[ 2 : \frac{8}{5} = 2 \times \frac{5}{8} = \frac{10}{8} = \frac{5}{4} = 1.25 \]
\[ -0.1875 = -\frac{1875}{10000} = -\frac{3}{16} \]
\[ \frac{3}{4} : ( - \frac{3}{16} ) = \frac{3}{4} \times ( - \frac{16}{3} ) = - \frac{16}{4} = -4 \]
\[ -4 + 3.5 = -0.5 \]
Ответ: -0.5