Bonjour,
N° 40:
B= (35x3)/21 x (10⁻³⁺⁵⁺¹)
B= 5 x 10³
N° 42:
B= (3x1.2)/(0.2) x 10²⁻¹²⁺⁷
B= 18 x 10⁻³
B= 1.8 x 10⁻²
