bjr
l'écriture 2³ signifie 2 x 2 x 2
l'écriture 2⁻³ signifie 1/2³ soit 1/(2 x 2 x 2)
1/2³ = 2⁻³
cas général
1 / aⁿ = a⁻ⁿ
exercice
1/(6 x 6 x 6 x 6) = 1/6⁴ = 6⁻⁴
1 / (4,3 x 4,3 x 4,3 x 4,3 x 4,3) = 1 / (4,3)⁵ = (4,3)⁻⁵
1/ (-8,1) × (-8,1) × (-8,1) = 1 / (-8,1)³ = (-8,1)⁻³
1 / (-7,51) x ( -7,51) = 1 / (-7,51)² = (-7,51)⁻²