Đáp án:
$\begin{array}{l}
\left( {\frac{{ - 5}}{9}} \right).\frac{3}{{11}} + \left( {\frac{{ - 3}}{{18}}} \right).\frac{{17}}{{11}} - \frac{3}{{11}}.\left( {\frac{{ - 5}}{{18}}} \right)\\
= \frac{{ - 10}}{{18}}.\frac{3}{{11}} - \frac{3}{{11}}.\frac{{17}}{{18}} + \frac{5}{{18}}.\frac{3}{{11}}\\
= \frac{3}{{11}}.\left( {\frac{{ - 10}}{{18}} - \frac{{17}}{{18}} + \frac{5}{{18}}} \right)\\
= \frac{3}{{11}}.\frac{{ - 10 + 5 - 17}}{{18}}\\
= \frac{3}{{11}}.\frac{{ - 22}}{{18}}\\
= \frac{{ - 2}}{6}\\
= \frac{{ - 1}}{3}
\end{array}$
