1. Exercice 26
(a)
720
N(2, 5) = 66
10 + ln2 (2, 5)
(b) Rechercher t tel que :
720
60 =
10 + ln2 (t)
720
10 + ln2 (t) =
60
10 + ln2 (t) = 12
ln2 (t) = 2
ln(t) = 2 → t = e 2 4, 1 heures
ln(t) =
ln(t) = − 2 → t = e− 2 0, 2 ∈ ED
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