Breuken aftrekken (reeks 1)

Trek de breuken af

\(\frac{7}{5}-\frac{8}{9}\)

\(\frac{7}{5}-\frac{8}{9}\\=\frac{63}{45}-\frac{40}{45}\\=\frac{63-40}{45}\\=\frac{23}{45}\)