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Ebru7158
@Ebru7158
May 2019
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Bonjour je dois faire ces deux exercices de maths pour lexercice 29 je ne suis pas sur de mes reponses mes c'est surtout lexercice 30 que je bloque pouvez vous m'aider pour ces deux exercices mercii davance
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loulakar
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Bonsoir,
Donner les valeurs de U1, U2, U3, U4, U5 :
Exercice 29 :
a) U0 = 2 et Un+1 = 4Un - 2
U1 = 4 x U0 - 2
U1 = 4 x 2 - 2
U1 = 8 - 2
U1 = 6
Je te laisse calculer les autres je t'indique juste le résultat
U2 = 22
U3 = 86
U4 = 342
U5 = 1368
b) U0 = 3 et Un+1 = - Un + 4
U1 = - 3 + 4 = 1
U2 = 3
U3 = 1
U4 = 3
U5 = 1
c) U0 = 0 et Un+1 = Un^2 + 3/(n + 1)
U1 = 0^2 + 3/(0 + 1) = 3
U2 = 3^2 + 3/(3 + 1) = 39/4
U3 = (39/4)^2 + 3/(39/4 + 1)
U3 = 1521/16 + 3 / (43/4)
U3 = 1521/16 + 3 x 4/43
U3 = je te laisse finir
Exercice 30 :
a) U0 = 2 et Un = 2 Un-1
U1 = 2 x U(1-1) = 2 x U0
U1 = 2 x 2 = 4
U2 = 2 x 4 = 8
U3 = 2 x 8 = 16
U4 = 2 x 16 = 32
U5 = 2 x 32 = 64
b) U0 = (-1) et Un = 4Un-1 + 2n
U1 = 4 x U0 + 2 x 0
U1 = -4
U2 = 4 x (-4) + 8 = (-8)
U3 = 4 x (-8) + 6 = -32 + 6 = (-26)
U4 = 4 x (-26) + 2 x 3 = -104 + 6 = -98
U5 = .... à toi de continuer
c) U0 = 3 et Un = 2Un-1 - 3
U1 = 2 x U0 - 3
U1 = 2 x 3 - 3
U1 = 6 - 3
U1 = 3
U2 = 2 x 3 - 3
U2 = 6 - 3 = 3
U3 = 2 x U2 - 3
U3 = 6 - 3
U3 = 3
U4 =.... je te laisse continuer
2 votes
Thanks 1
ebru7158
U5=1366 non ?
ebru7158
pour lexo 1
ebru7158
la a
loulakar
Oui au temps pour moi il y a une erreur c'est bien 1368 - 2 = 1366
ebru7158
Merci
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Verified answer
Bonsoir,Donner les valeurs de U1, U2, U3, U4, U5 :
Exercice 29 :
a) U0 = 2 et Un+1 = 4Un - 2
U1 = 4 x U0 - 2
U1 = 4 x 2 - 2
U1 = 8 - 2
U1 = 6
Je te laisse calculer les autres je t'indique juste le résultat
U2 = 22
U3 = 86
U4 = 342
U5 = 1368
b) U0 = 3 et Un+1 = - Un + 4
U1 = - 3 + 4 = 1
U2 = 3
U3 = 1
U4 = 3
U5 = 1
c) U0 = 0 et Un+1 = Un^2 + 3/(n + 1)
U1 = 0^2 + 3/(0 + 1) = 3
U2 = 3^2 + 3/(3 + 1) = 39/4
U3 = (39/4)^2 + 3/(39/4 + 1)
U3 = 1521/16 + 3 / (43/4)
U3 = 1521/16 + 3 x 4/43
U3 = je te laisse finir
Exercice 30 :
a) U0 = 2 et Un = 2 Un-1
U1 = 2 x U(1-1) = 2 x U0
U1 = 2 x 2 = 4
U2 = 2 x 4 = 8
U3 = 2 x 8 = 16
U4 = 2 x 16 = 32
U5 = 2 x 32 = 64
b) U0 = (-1) et Un = 4Un-1 + 2n
U1 = 4 x U0 + 2 x 0
U1 = -4
U2 = 4 x (-4) + 8 = (-8)
U3 = 4 x (-8) + 6 = -32 + 6 = (-26)
U4 = 4 x (-26) + 2 x 3 = -104 + 6 = -98
U5 = .... à toi de continuer
c) U0 = 3 et Un = 2Un-1 - 3
U1 = 2 x U0 - 3
U1 = 2 x 3 - 3
U1 = 6 - 3
U1 = 3
U2 = 2 x 3 - 3
U2 = 6 - 3 = 3
U3 = 2 x U2 - 3
U3 = 6 - 3
U3 = 3
U4 =.... je te laisse continuer