bonjour
a⁻ⁿ = 1/aⁿ
par exemple
2⁻¹ = 1/2 ; 3⁻² = 1/3² ; 5⁻³ = 1/5³
a) 0,5⁻¹ = 1/0,5 = 10/5 = 2
b) (1/3)⁻⁵ = 1/(1/3)⁵ = 1/(1/3⁵) = 1 x (3⁵/1) = 3⁵ = 243
c) 2,5⁻² = = 1/2,5² = 1/6,25 = 0,16
