salut j'ai besoin d'un coup de main svp et merci​

Explications étape par étape :

A = ( 1 / 3 )¹⁸ * 3²⁰

⇔ A = 3⁻¹⁸ * 3²⁰

⇔ A = 3⁻¹⁸⁺²⁰

⇔ A = 3²

⇔ A = 9

B = ( 2/3 )¹¹ * ( 3/2 )¹⁰

⇔ B = ( 3/2 ) ⁻¹¹ * ( 3/2 )¹⁰

⇔ B = ( 3/2 )⁻¹¹⁺¹⁰

⇔ B = ( 3/2 ) ⁻¹

⇔ B = 2/3

C = ( -5/11 )³ * ( 11/5 )⁴

⇔ C = ( -11/5 )⁻³ * ( 11/5 )⁴

⇔ C = - ( 11/5 )⁻³ * ( 11/5 )⁴

⇔ C = - ( 11/5 ) ⁻³⁺⁴

⇔ C = - 11/5

D =  ( -3/4 )⁶ * ( 4/3 )⁵

⇔ D = ( -4/3 )⁻⁶ *  ( 4/3 )⁵

⇔ D =  ( 4/3 )⁻⁶ * ( 4/3 )⁵

⇔ D =  ( 4/3 )⁻¹

⇔ D =  3/4