bonjour,
A = 14 x 10 ⁵ x 35 x 10 ⁻³ sur 21 x 10 ³
A = 14 x 35 x 10 ² sur 21 x 10 ³
A = 490 x 10 ² : 21 x 10 ³
A = 490/21 x 10 ⁻¹ = 70/3 x 10 ⁻¹
B = 35 x 3 x 10 ⁻³ x 10 ⁵ : 21 x 10 ⁻¹
B = 105 x 10 ² : 21 x 10 ⁻¹
B = 5 x 10 ³
C = 60 x 10 ³ : 120 x 10 ⁻³
C = 0.5 x 10 ⁶ = 5 x 10 ⁵