Question

Dados Log 2= 0,30, log 3= 0,48 e log 5= 0,70, calcule: log 1,25

Answer 1

$log1,25=log(\frac{125}{100}) = log(\frac{5*5*5}{100})$

Aplicando as propriedades dos logaritmos:

$log(\frac{5*5*5}{100}) = log5+log5+log5 - log100\\\\0,7+0,7+0,7 -2 = 0,1$

Obs: log100=2

Logo, log1,25 = 0,1