Répondre :
Bonjour,
A = 35 × 10¹⁸ = 3,5 × 10¹ × 10¹⁸ = 3,5 × 10¹⁺¹⁸ = 3,5 × 10¹⁹
B = 0,00002 × 10⁻⁷ = 2 × 10⁻⁵ × 10⁻⁷ = 2 × 10⁻⁵⁺⁽⁻⁷⁾ = 2 × 10⁻¹²
A × B = 3,5 × 10¹⁹ × 2 × 10⁻¹²
= (3,5 × 2) × 10¹⁹⁺⁽⁻¹²⁾
= 7 × 10⁷
Bonjour,
A = 35 × 10¹⁸ = 3,5 × 10¹ × 10¹⁸ = 3,5 × 10¹⁺¹⁸ = 3,5 × 10¹⁹
B = 0,00002 × 10⁻⁷ = 2 × 10⁻⁵ × 10⁻⁷ = 2 × 10⁻⁵⁺⁽⁻⁷⁾ = 2 × 10⁻¹²
A × B = 3,5 × 10¹⁹ × 2 × 10⁻¹²
= (3,5 × 2) × 10¹⁹⁺⁽⁻¹²⁾
= 7 × 10⁷