Question

Considerando log5=0,70, determine o valor do log 1/2

Answer 1

$log 5 = 0,70\\\\log(\frac{1}{2}) = log 1 - log 2 = 0 - log(\frac{10}{5}) = - (log 10 - log 5) = - ( 1 - 0,7) = - (0,3) = \\\\\boxed{-0,3}$