\(=\left(\dfrac{-5}{11}\cdot\dfrac{8}{13}+\dfrac{-5}{11}\cdot\dfrac{5}{13}\right)-\dfrac{1}{33}\)
\(=\dfrac{-5}{11}-\dfrac{1}{33}=\dfrac{-16}{33}\)
\(=\left(\dfrac{5}{11}\times\left(-\dfrac{8}{13}-\dfrac{5}{13}\right)\right)-\dfrac{1}{33}=\left(\dfrac{5}{11}\times-1\right)-\dfrac{1}{33}=-\dfrac{15}{33}-\dfrac{1}{33}=-\dfrac{16}{33}\)