log(6) = log(2) + log(3)
log(18) = log(2) + log(3²) = log(2) + 2log(3)
log(27) = log(3^3) = 3log(3)
log(4) = 2log(2)
Q2
log(10) = 1
log(10 000) = 4
log (0,001) = -3
log (10-3) = -3
log (10^7) = 7
log (10^-4) = -4
2 000 € placé à 5,5 pendant 5 ans
2 000 * 1,055 ^ 5 (puissance 5)
La somme aura doublé :
2000 * 1,055^x = 4000
1,055^x = 2
x = 12,94