Question

Valor do log 2 + log 20 + log 25

Answer 1

$log\ 2 = 0,3\\\\ log\ 20 = log\ 2\cdot10 = log\ 2+log\ 10 = 0,3+1 = 1,3\\\\\ log\ 25 = log\ 5^2 = 2\ log\ 5 = 2\ \cdot0,7 = 1,4\\\\\ log\ 2+\ log\ 20+\ log\ 25 = 0,3+1,3+1,4 = \boxed{3,0}$