bonsoir,
A = 3 ⁻³ x 3 ³
= 1/27 x 9
= 9/27
= 1/3
B = ( - 4 ) ⁻⁴ x 4 ⁴
= 1/256 x 256
= 256 /256
= 1
A= 1
B= -1
Voilà
Bonne soirée