bonjour
R = 12 x 10 ³ = 12 000 = 1.2 x 10 ⁴
S = 1 200 x 10 ⁸ = 1 200 000 000 00 = 1.2 x 10 ¹¹
T = 105 x 10 ² : 21 x 10 ⁻¹
t = 5 x 10 ³ = 5 000
U = 2 079 x 10 ⁷ : 19.8 x 10 ¹³
U = 105 x 10 ⁻⁶
U 0. 000 105 = 1.05 x 10 ⁻⁴