D = 5³⁻ⁿ /(5ⁿ⁺²)²
= 5³⁻ⁿ / (5²ⁿ⁺⁴) 3 - n - (2n + 4) = 3 - n - 2n - 4 = - 3n -1
exposant numérateur - exposant dénominateur
= 5⁻³ⁿ⁻¹
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D = 5³⁻ⁿ /(5ⁿ⁺²)²
= 5³⁻ⁿ / (5²ⁿ⁺⁴) 3 - n - (2n + 4) = 3 - n - 2n - 4 = - 3n -1
exposant numérateur - exposant dénominateur
= 5⁻³ⁿ⁻¹