a) log 128 = log 2^7 = 7log2 = 7.(0,301) = 2,101
b)log 6,4 = log (64/10) = log 64 - log 10
= log 2^6 - log 10
= 6log2 - log10
- 6(0,301) -1
- 1,806 -1
= - 2,806
c) log 0,625 = log 625/1000 = log (5^4/ 10^3)
log5^4 - log10^3
4log5 - 3log10
4log(10/2) - 3log10
4(log10 - log2) -3log10
4log10 -4log2-3log10
-4log2 +4log10-3log10
-4(0,301) +1
-1,204 + 1
-0,204
e fui
