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Sagot :

Bonjour,

    Uₙ₊₁ = 2/3Uₙ - 1

⇔ Uₙ₊₁ = 3/3Uₙ - 1/3Uₙ - 1

⇔ Uₙ₊₁ = Uₙ - 1/3Uₙ - 1

⇔ Uₙ₊₁ - Uₙ =  - 1/3Uₙ - 1

⇒ Démonstration faite !

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