amplificare = înmulțire
[tex] {}^{2)} \frac{2}{3} = \frac{2 \times 2}{3 \times 2} = \frac{4}{6} [/tex]
[tex] {}^{7)} \frac{2}{3} = \frac{2 \times 7}{3 \times 7} = \frac{14}{21} [/tex]
[tex] {}^{10)} \frac{2}{3} = \frac{2 \times 10}{3 \times 10} = \frac{20}{30} [/tex]
[tex] {}^{12)} \frac{2}{3} = \frac{2 \times 12}{3 \times 12} = \frac{24}{36} [/tex]
