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Tarine
@Tarine
June 2021
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Svt aidez moi jsuis vraiment bloqué
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caylus
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Bonjour,
1) voir fichier Excel joint
2) ni l'un ni l'autre voir Un-Un-1 , Un/Un-1
3) dernière colonne
a) Un=0.7 Un-1 +12
Vn=Un-40
Vn-1=Un-1-40
Vn/Vn-1= (Un-40)/(Un-1 -40)
= (0.7Un-1+12-40)/(Un-1-40)
=(0.7 Un-1 -28)/ (Un-1-40)
=0.7(Un-1 -40) /(Un-1 -40)= 0.7
b)
V0=-20 car (20-40)
V1=-20*0.7
V2=-20*0.7²
V3=-20* 0.7^3
...
Vn= -20*0.7 ^n
Un=40-20*0.7^n
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Thanks 1
Tarine
merci beaucoup
caylus
De rien
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Verified answer
Bonjour,1) voir fichier Excel joint
2) ni l'un ni l'autre voir Un-Un-1 , Un/Un-1
3) dernière colonne
a) Un=0.7 Un-1 +12
Vn=Un-40
Vn-1=Un-1-40
Vn/Vn-1= (Un-40)/(Un-1 -40)
= (0.7Un-1+12-40)/(Un-1-40)
=(0.7 Un-1 -28)/ (Un-1-40)
=0.7(Un-1 -40) /(Un-1 -40)= 0.7
b)
V0=-20 car (20-40)
V1=-20*0.7
V2=-20*0.7²
V3=-20* 0.7^3
...
Vn= -20*0.7 ^n
Un=40-20*0.7^n