Bonjour,

(7-5)4 = 2*4 = 8

5x4 - 7x4 = 20 - 28 = -8

4(5+7) = 4*12 = 48

5x4 + 5x7 = 20 + 35 = 55

4x5 + 4x7 = 20 + 28 = 48

7x4 - 5x4 = 28 - 20 = 8

5(4+7) = 5*11 = 55

4(5-7) = 4*-2 = -8

Bonjour,

Réponse:

➣ Méthode 1 :

• (7 - 5)4 = 2 × 4 = 8
• 5 × 4 - 7 × 4 = 20 - 28 = - 8
• 4(5 + 7) = 4 × 12 = 48
• 5 × 4 + 5 × 7 = 20 + 35 = 55

➣ Méthode 2 :

• (7 - 5)4 = 7 × 4 - 5 × 4 = 28 - 20 = 8
• 5 × 4 - 7 × 4 = 4(5 - 7) = 4 × (- 2) = - 8
• 4(5 + 7) = 4 × 5 + 4 × 7 = 20 + 28 = 48
• 5 × 4 + 5 × 7 = 5(4 + 7) = 5 × 11 = 55

En espérant t'avoir aidé, bonne continuation ! ☺️