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2 pe 5 ori 0,25 plus 0,25 ori 1 pe 3​

Răspuns :

[tex] \frac{2}{5} \times 0.25 + 0.25 \times \frac{1}{3} = \frac{2}{5} \times \frac{1}{2} + \frac{1}{2} \times \frac{1}{3} = \frac{1}{5} + \frac{1}{6} = \frac{11}{30} [/tex]