Sagot :
bonjour
4^n3^2^n -1 / 2^n3^n +1
= (2^n×3^n -1) (2^n×3^n +1) / (2×3)^n +1
= ((2×3)^n -1) (( 2×3)^n +1) / 6^n +1
= (6^n -1) (6^n +1) / 6^n +1
= 6^n-1
voilà , bonne journée
bonjour
4^n3^2^n -1 / 2^n3^n +1
= (2^n×3^n -1) (2^n×3^n +1) / (2×3)^n +1
= ((2×3)^n -1) (( 2×3)^n +1) / 6^n +1
= (6^n -1) (6^n +1) / 6^n +1
= 6^n-1
voilà , bonne journée