Breuken haakjesregel (reeks 2)

Bereken

\(+\left(\frac{-5}{-4}\right) +\left(\frac{7}{-3}\right) +\left(\frac{-2}{-2}\right)\)

\(+\left(\frac{-5}{-4}\right) +\left(\frac{7}{-3}\right) +\left(\frac{-2}{-2}\right)\\= \frac{5}{4}- \frac{7}{3}+\frac{2}{2}\\=\frac{5}{4}-\frac{7}{3}+\frac{1}{1}\\=\frac{15}{12}-\frac{28}{12}+\frac{12}{12}\\=\frac{15-28+12}{12}\\=\frac{-1}{12}\)