Breuken verm. (reeks 2)

Vermenigvuldig de breuken

\(\frac{11}{-12} . \frac{3}{9}\)

\(\frac{11}{-12} . \frac{3}{9}\\=-\frac{11}{12}.\frac{1}{3}\\=-\frac{11.1}{12.3}\\=-\frac{11}{36}\)