bonjour déjà
ex 7
1 / (9x9) = 1 / 9² = 9⁻²
1 / (7x7x7) = 1 / 7³ = 7⁻³
etc
ex 9
10⁻¹ = 1/10¹ = 1/10 = 0,1
10⁻² = 1/10² = 1/100 = 0,01
10⁻³ tu as compris
2⁻¹ = 1/2¹ = 1/2 = 0,5
