Breuken haakjesregel (reeks 2)

Bereken

\(+\left(\frac{4}{-5}\right) +\left(\frac{8}{-8}\right) +\left(\frac{2}{7}\right)\)

\(+\left(\frac{4}{-5}\right) +\left(\frac{8}{-8}\right) +\left(\frac{2}{7}\right)\\= \frac{-4}{5}- \frac{8}{8}+\frac{2}{7}\\=\frac{-4}{5}-\frac{1}{1}+\frac{2}{7}\\=\frac{-28}{35}-\frac{35}{35}+\frac{10}{35}\\=\frac{-28-35+10}{35}\\=\frac{-53}{35}\)