11.

\( (-1) - \left( -5\frac{1}{2} \right) \cdot \frac{4}{11} \)

\( (-1) - \left( -\frac{11}{2} \right) \cdot \frac{4}{11} \)

\( (-1) - \left( -\frac{4}{2} \right) \)

\( -1 - (-2) \)

\( -1 + 2 \)

Ответ: \( 1 \)