Breuken verm. (reeks 2)

Vermenigvuldig de breuken

\(\frac{10}{11} . \left(\frac{-9}{-12}\right)\)

\(\frac{10}{11} . \left(\frac{-9}{-12}\right)\\=+\frac{10}{11}.\frac{3}{4}\\=+\frac{10.3}{11.4}\\=\frac{30}{44}\\=\frac{15}{22}\)