bonsoir
( 2/3 ) ⁻³ = ( 3/2 ) ³ = 27/8 = 3.375
0. 000 485 = 4.85 x 10 ⁻⁴
629.8 = 6.298 x 10 ²
0.83 x 10 ⁵ = 8.3 x 10 ⁴
5 ⁸ / 5 ⁻² = 5 ¹⁰
10 ⁻⁶ x 10 ² / 10 ² = 10 ⁻ ⁴ /10 ² = 10 ⁻⁶
