Breuken haakjesregel (reeks 2)

Bereken

\(+\left(\frac{-4}{7}\right) +\left(\frac{-5}{4}\right) -\left(\frac{4}{9}\right)\)

\(+\left(\frac{-4}{7}\right) +\left(\frac{-5}{4}\right) -\left(\frac{4}{9}\right)\\= \frac{-4}{7}- \frac{5}{4}-\frac{4}{9}\\=\frac{-144}{252}-\frac{315}{252}-\frac{112}{252}\\=\frac{-144-315-112}{252}\\=\frac{-571}{252}\)