Răspuns:
[tex]( \frac{7}{13} + \frac{6}{13} ) - \frac{8}{10} \\ \\ = \frac{7 + 6}{13} - \frac{8}{10} \\ \\ = \frac{13}{13} - \frac{8}{10} \\ \\ = 1 - \frac{8}{10} \\ \\ = 1 - \frac{4}{5} \\ \\ = \frac{5 - 4}{5} \\ \\ = \bf\pink{\boxed{ \frac{1}{5} }}[/tex]
