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