Вычислите: -4/11*15/17-7/11*15/17.

\[- \frac{4}{11} \cdot \frac{15}{17} - \frac{7}{11} \cdot \frac{15}{17} =\]

\[= \frac{15}{17} \cdot \left( - \frac{4}{11} - \frac{7}{11} \right) =\]

\[= \frac{15}{17} \cdot \left( - \frac{11}{11} \right) = - \frac{15}{17}.\]