Bonjour,
A = 32,4 × 10³ = 3,24 × 10¹ × 10³ = 3,24 × 10⁴
B = 0,0052 × 10³ = 5,2 × 10⁻³ × 10³ = 5,2 × 10⁰ = 5,2
C = 902 × 10⁻⁶ = 9,02 × 10² × 10⁻⁶ = 9,02 × 10⁻⁴
D = 621 000 × 10⁻⁴ = 6,21 × 10⁵ × 10⁻⁴ = 6,21 × 10¹
E = 0,0038 × 10⁸ = 3,8 × 10⁻³ × 10⁸ = 3,8 × 10⁵
F = 5 × 10⁵ × 9 × 10⁶ = 5 × 9 × 10⁵⁺⁶ = 45 × 10¹¹ = 4,5 × 10¹²