diketahui log2=0,3010 log3=0,4771,dan log5=0,6989,tentukan a.log 60 b.log 0,45

a) = log (3/5)
= log 3 - log 5
= 0,4771 - 0,6989
= 0,2218

b) = log 0,45
= log ( 45/100 )
= log ( 3^2/2^2x5)
= log 3^2 - log 2^2 - log 5
= log 2 ( 0,4771 ) - 2 ( 0,3010 ) - 0,6989
= - 0,3467

*Ket : / = Per
^ = Pangkat