Bonjour,
pare exemple :
a) 150 × 10³ × 8 × 10⁵ = 1,5 × 10² × 10³ × 8 × 10⁵
= 1,5 × 8 × 10²⁺³⁺⁵
= 12 × 10¹⁰
= 1,2 × 10¹¹
= 120 000 000 000
b) 2 × 10³ × 5 × (10⁻⁵)⁻² = 2 × 5 × 10³ × 10⁻⁵ˣ⁽⁻²⁾
= 10 × 10³ × 10¹⁰
= 10¹ × 10³⁺¹⁰
= 10¹⁺³⁺¹⁰
= 10¹⁴
= 100 000 000 000 000
