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siazzle
@siazzle
January 2021
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Bonjour, j'aurais besoin d'aide pour cette exercice s'il vous plaît!
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scoladan
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Bonjour,
Vn+1 = 3/Un+1 = 3(3 + 2Un)/3Un = 3/Un + 2
⇒ Vn+1 - Vn = 3/Un + 2 - 3/Un = 2
⇒ (Vn) arithmétique de rason r = 2
⇒ Vn = V0 + n x r = 3/3 + 2n = 2n + 1
⇒ Un = 3/Vn = 3/(2n + 1)
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Verified answer
Bonjour,Vn+1 = 3/Un+1 = 3(3 + 2Un)/3Un = 3/Un + 2
⇒ Vn+1 - Vn = 3/Un + 2 - 3/Un = 2
⇒ (Vn) arithmétique de rason r = 2
⇒ Vn = V0 + n x r = 3/3 + 2n = 2n + 1
⇒ Un = 3/Vn = 3/(2n + 1)