Réponse :
Explications étape par étape :
Bonjour
A = ( - 5 - ( -8)) × (-2) - ( -9)/(-1,5)
A = ( - 5 + 8)× (-2) - (6)
A = 3 × ( - 2) - 6
A = ( - 6) - 6
A = ( -12)
B = 20 - 12 × ( - 4 + 4 × 2)
B = 20 - 12 × ( - 4 + 8)
B = 20 - 12 × 4
B = 20 - 48
B = - 28
A/B - 1 = (-12)/(- 28) - 1 = (4×3) / (4×7) - 1 = 3/7 - 1 = 3/7 - 7/7 = - 4/7
