bonsoir
10 ⁻⁵ x 10 ⁹ x 10 ¹⁴ = 10 ⁻⁵⁺⁹⁺¹⁴ = 10 ¹⁸
( 10³) ⁻⁶ x 10 ²¹ = 10 ³ˣ⁻⁶ ⁺²¹ = 10 ³
( 10 ⁴)⁷ / 10 ¹⁵ = 10 ¹¹⁻¹⁵ = 10 ⁻⁴
10 ³ x 10 ⁻⁹ : 10 ⁶ x 10 ¹¹ = 10 ⁻⁶ / 10 ¹⁷ = 10 ⁻²³
