log5(0.6) - log5(3) = log5(0.6/3) = log5(0.2) =log5(2/10) = log5(1/5) = log5(5^(-1)) = -1
log2.5(25) - log2.5(4) = log2.5(25/4) = log2.5(25*1/4) = log2.5(25*0.25) = log2.5(2.5*2.5) =
= log2.5(2.5^2) = 2
log(0.0025) + log(0.004) = log(0.0025*0.004) = log(0.25*10^(-2)*4*10^(-3)) =
= log(0.25*4*10^(-2)*10^(-3)) = log(1*10^(-2-3)) = log(10^(-5)) = -5
log5(0.032) + log5(1.25) = log5(0.032*1.25) = log5(0.04) =log5(4/100) = log5(1/25) =
= log5(5^(-2)) = -2