Respuesta :

[tex]\begin{gathered} \frac{6}{7}+(\frac{-11}{8}) \\ \frac{6}{7}-\frac{11}{8}=\frac{6\cdot8-7\cdot11}{7\cdot8}=\frac{48-77}{56}=-\frac{29}{56}\approx-0.52 \end{gathered}[/tex]