Question

4) Dados log 2= 0,30 , log 3=0,48 e
log 5 = 2,32, calcule:
a) log 15
b) log 45
c) log 20
d) log 5​

Answer 1

a) log 15 = log 3 · 5 = log 3 + log 5 = 0,48 + 2,32 = 2,8

b) log 45 = log 3² · 5 = log 3² + log 5 = 2 log 3 + log 5 = 2 · 0,48 + 2,32 = 3,28

c) log 20 = log 2 ·10 = log 2 + log 10 = 0,30 + 1 = 1,3

d) log 5 = 2,32