Răspuns :
[tex] \frac{a}{b} \times \frac{b}{c} \times \frac{c}{d} = \frac{a}{d} [/tex]
[tex] \frac{2}{5} \times \frac{3}{4} \times \frac{5}{6} = \frac{1}{4} [/tex]
[tex] \frac{a}{b} \times \frac{b}{c} \times \frac{c}{d} = \frac{a}{d} [/tex]
[tex] \frac{2}{5} \times \frac{3}{4} \times \frac{5}{6} = \frac{1}{4} [/tex]