1)log10 5+log10 2 2)log12 2+log12 72 3)log10 8+log10 125 4)log3 6+log3 1.5

1)log10 5+log10 2=log10 (5*2)=log10 (10) =1
2)log12 2+log12 72 = log 12 (2*72)= log12 (144)=2
3)log10 8+log10 125=log 10 (8*125)=log10 (1000)=3
4)log3 6+log3 1.5=log3 (6* 1.5) = log3 (9)=2