Réponse :
Bonsoir
1) 1/3 + 1/6 = 2/6 + 1/6 = 3/6 = 1/2
2 - 3/2 = 4/2 - 3/2 = 1/2
donc 1/3 + 1/6 = 2 - 3/2
2) (3 + 5√2)² = 3² +2×3×5√2 + (5√2)² = 9 + 30√2 + 50 = 59 + 30√2
donc 3 + 5√2 = √(59 + 30√2)
