Bonjour,
10 millions = 10¹ × 10⁶ = 10¹⁺⁶ = 10⁷
100 millionièmes = 10² × 10⁻⁶ = 10²⁺⁽⁻⁶⁾ = 10⁻⁴
0,1 millième = 10⁻¹ × 10⁻³ = 10⁻¹⁺⁽⁻³⁾ = 10⁻⁴
0,01 milliard = 10⁻² × 10⁹ = 10⁻²⁺⁹ = 10⁷
10³ + 10⁴ = 1 000 + 10 000 = 11 000 ≠ 10⁷
10³ × 10² = 10³⁺² = 10⁵ ≠ 10⁶
10⁷/10² = 10⁷⁻² = 10⁵ ≠ 10⁶
128 mg = (128 ÷ 1 000) g = 128 × 10⁻³ g = 1,28 × 10⁻¹ g
0,031 hL = 0,031 × 10² L = 3,1 × 10⁰ L
631 nm = 631 × 10⁻⁹ m = 6,31 × 10⁻⁷ m
