log(25)=2log(5)=2log(10/2)=2(log(10)-log(2))=2(1-0.3010)=1.398.
log(2000)=log(1000)+log(2)=3.3010.
27=33, log(27)=3log(3), 2log(27)=6log(3).
108=2233; log(108)=2log(2)+3log(3); log(10.8)=log(108/10)=log(108)-1.
1.0334=log(108)-1, log(108)=2.0334.
2.0334=0.6020+3log(3),
3log(3)=1.4314, log(3)=0.4771; 6log(3)=2log(27)=2.8626.
log(2000)+2log(27)-log(25)=
3.3010+2.8626-1.398=4.7656.