Réponse:
Un = Up + (n-p)r (formule de cours a connaitre)
U15 = U4 + (15-4)r
-24 = 20 + 11r
11r = -44
r=-4
U15= Uo +15r
-24 = Uo - 15×4
Uo = 60-24
Uo = 36
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Réponse:
Un = Up + (n-p)r (formule de cours a connaitre)
U15 = U4 + (15-4)r
-24 = 20 + 11r
11r = -44
r=-4
U15= Uo +15r
-24 = Uo - 15×4
Uo = 60-24
Uo = 36