[tex] \frac{9}{{12}^{3} } = \\ \\ = {}^{3)} \frac{9}{12 \times 12 \times 12} = \\ \\ = {}^{3)} \frac{3}{4 \times 12 \times 12} = \\ \\ = \frac{1}{4 \times 4 \times 12} = \\ \\ = \frac{1}{192} [/tex]
Am simplificat de doua ori prin 3, adică am simplificat prin 9.
