Breuken haakjesregel (reeks 2)

Bereken

\(-\left(\frac{5}{-6}\right) -\left(\frac{-9}{3}\right) -\left(\frac{-12}{-3}\right)\)

\(-\left(\frac{5}{-6}\right) -\left(\frac{-9}{3}\right) -\left(\frac{-12}{-3}\right)\\= \frac{5}{6}+ \frac{9}{3}-\frac{12}{3}\\=\frac{5}{6}+\frac{3}{1}-\frac{4}{1}\\=\frac{5+3-4}{6}\\=\frac{4}{6}\\=\frac{2}{3}\)