Răspuns:
Explicație pas cu pas:
2/5 × [ 0,5 + 0,5 × (1/3) ] =
= 2/5 × [ 5/10 + (5/10) × (1/3) ] =
= 2/5 × [ 1/2 + (1/2)×(1/3) ] =
= 2/5 × (1/2 + 1/6) =
= 2/5 × ( 3/6 + 1/6) =
= (2/5) × 4/6 =
= (2/5) × 2/3 =
= 4/15 → fractie ireductibila
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0,5 = 5/10 = (5:5)/(10:5) = 1/2
1/2 + 1/6
-> amplific fractia 1/2 cu 3, pentru a obtine acelasi numitor (6)