Question

Sendo log2=0,3; log3=0,4 e log5=0,7. Calcule: log8/600

Answer 1

8=2.2.2=2^3
600=2.2.2.3.5.5=2^3.3.5^2

log 8/600=
log 8 -log 600=
log 2^3-log (2^3.3.5^2)=
3log2-(3log2+log3+2log5)=
3.0,3-(3.0,3+0,4+2.0,7)=
0,9-(0,9+0,4+1,4)=
0,9-2,7=
-1,8