bjr
A = 1⁵/( x-⁴ )⁵
= 1 / x -²⁰
= x²⁰
B = x-³ / x-⁷
= x⁴
C = ((x³)²)⁴
=( x⁶ )⁴
= x ²⁴
D = x-⁶ /x¹⁴
= x -²⁰
bonne journée
