1)log(12)(3*4)=log(12)12=1
2)log(2)(3*2/3)=log(2)2=1
3)log(2(√3*√(4/3))=log(2)2=1
4)log(7)(196/2²)=log(7)49=2
5)log(5)(2:2/5)=log(5)5=1
6)log(2)(5*36/35)=log(2)8=3
7)log(5)(8/2*25/4)=log(5)25=2
8)10^lg(2*3)=10^lg6=6
9)10^(1+lg5)=10*10^lg5=10*5=50
10)log(ab)b³*log(b)ab=log(b)b/log(b)ab *lg(b)ab=log(b)b=1