log 1/5 (4/125 / 4/5) = log 1/5 (1/25) =log 1/5 (1/5)^2 = 2*log 1/5 (1/5) =2*1 =2
log₁/₅(4/125)-log₁/₅(4/5)=log₁/₅(4/125:4/5)=log₁/₅(1/25)=2
log 1/5 (4/125 / 4/5) = log 1/5 (1/25) =log 1/5 (1/5)^2 = 2*log 1/5 (1/5) =2*1 =2
log₁/₅(4/125)-log₁/₅(4/5)=log₁/₅(4/125:4/5)=log₁/₅(1/25)=2