Réponse :
Explications étape par étape :
Exercice 2
Rappel log 10^n = nlog10= n car log10 = 1
a) log100=log10^2=2log10 = 2
b) log100000=log10^5=5log10=5
c) log0,01=log10^-2=-2log10=-2
d) log10^-3=-3log10=-3
e) log(10^4X10^2)=log10^6=6log10=6
f) log(0,001X0,1) = log10^-4=-4log10=-4
Exercice 3
a) log10= log4X3=log4 + log3= log2² + log3 = 2log2 + log3
b) log(2/9) = log2 - log9 = log2 - log3²= log2 - 2log3
c) log27 = log3^3= 3log3
d) log(2^4) = 4 log2
