Question

Considerando log2 = 0,30 log3 = 0,47 e log5 = 0,70 determine o valor de log2 15

Answer 1

$\log_{2}15= \dfrac{\log_{}15}{\log_{}2} = \dfrac{\log_{}3.5}{\log_{}2} = \dfrac{\log_{}3+\log_{}5}{\log_{}2} = \dfrac{0,47+0,70}{0,30}$$= \dfrac{1,17}{0,30} =3,9$