Réponse :
Explications étape par étape
D = (1/4) / [ 1 - (1/3) ]
⇔ D = (1/4) / [ (3 - 1) / 3 ]
⇔ D = (1/4) / (2/3)
⇔ D = 1/4 . 3/2
⇔ D = 3/8
E = 3⁷ . 4⁵ / (3²)² . 4¹²
⇔ E = 3⁷ . (2²)⁵ / 3⁴ . (2²)¹²
⇔ E = 3⁷ . 2¹⁰ / 3⁴ . 2²⁴
⇔ E = 3³ / 2¹⁴
⇔ E = 3³ . 2⁻¹⁴
