Thực hiện phép tính sau: + \dfrac{{ - 5}}{{13}} + \dfrac{{ - 8}}{{13}} -

* Hướng dẫn giải

\(\begin{array}{l}a)\,\dfrac{{31}}{{17}} + \dfrac{{ - 5}}{{13}} + \dfrac{{ - 8}}{{13}} - \dfrac{{14}}{{17}}\\ = \left( {\dfrac{{31}}{{17}} - \dfrac{{14}}{{17}}} \right) + \left( {\dfrac{{ - 5}}{{13}} + \dfrac{{ - 8}}{{13}}} \right)\\ = \dfrac{{17}}{{17}} + \dfrac{{ - 13}}{{13}}\\ = 1 + \left( { - 1} \right)\\\, = 0\end{array}\)