Question

Usando apenas que log 20 =1,30; log 30 =1,47; log 60 =1,47; calcule:
a) log4 + log5
b) log150 - log5
c) log16 + 2log5
d) 2log15 - log4

Answer 1

a)    log4 + log 5 = log 4.5 = log 20 = 1,30
b) log 150 - log 5 = log 150:5 = log 30 = 1,47
c) log 16 + 2.log5 = log16 + log 5² = log 16. 25 = log 400 = log 20² = 2log20= 2. 1,30 = 2,60
d) 2log15 - log 4= 2. 1,1761 - 0,6021 = 2,3522 - 0,6021 = 1,7501