Réponse :

Explications étape par étape :

Bonjour

A = (x⁷)² / x¹⁵

A = x¹⁴/x¹⁵

A = x¹⁴⁻¹⁵

A = x⁻¹

B = (x⁻⁵) × x³ /x⁻¹²

B = x⁻⁵⁺³/x⁻¹²

B= x⁻²/x⁻¹²

B = x⁻²⁻⁽⁻¹²⁾

B = x⁻²⁺¹²

B = x¹⁰

C = x × x³ /(x²/x)

C = x¹⁺³/ x

C = x⁴⁻¹

C = x³

D = 1/(x⁻⁷ × x³ )

D = 1/ x⁻⁷⁺³

D = 1 /x⁻⁴

D = x⁴

exo 79

A = xⁿ⁺³ /(xⁿ)³

A = xⁿ⁺³/x³ⁿ

A = xⁿ⁺³⁻³ⁿ

A = x⁻²ⁿ⁺³

B = (x² × x⁵ⁿ)/ (x²ⁿ × x)

B = x²⁻⁵ⁿ/ x²ⁿ⁺¹

B = x²⁻⁵ⁿ⁻²ⁿ⁻¹

B = x¹⁻⁷ⁿ