Réponse :
A = (4 x 8 - 3²)/(7 x 2³ - (5 x 2)²)
= (32 - 8)/(7 x 8 - 5² x 2²)
= 24/(56 - 100)
= 24/- 44
= - 6/11
B = 2⁻³ - 2⁻¹ x 3² + 7 x 4⁻¹
= 1/2³ - 3²/2¹ + 7/4¹
= 1/8 - 9/2 + 7/4
= 1/8 - 36/8 + 14/8
= 15/8 - 36/8
= - 21/8
Explications étape par étape :
