bonsoir
( 1/5)² x 5 ⁻³ = 5 ⁻² x 5 ⁻³ = 5 ⁻⁵
( 1/4 ) x 4 ⁻⁵ = 4 ⁻¹ x 4 ⁻⁵ = 4 ⁻⁶
( 2/3 ) ⁻⁴ x ( 3/2 ) ⁵ = ( 2/3 ) ⁻⁴ x ( 2 /3 ) ⁻⁵ =( 2/3 ) ⁻⁹
