Răspuns :
[tex] \frac{5}{10} \times \frac{9}{10} = \frac{1}{2} \times \frac{9}{10} = \frac{1 \times 9}{2 \times 10} = \frac{9}{20} [/tex]
[tex] \frac{5}{10} \times \frac{9}{10} = \frac{1}{2} \times \frac{9}{10} = \frac{1 \times 9}{2 \times 10} = \frac{9}{20} [/tex]