Log₅ 6,25 + log₅ 4 = log₅ 6,25*4 = log₅ 25 = 5
log₈ 256 - log₈ 0,5 = log ₈ 256/0.5 = log₈ 512 = 3
log₀,₆ 10 - log ₀,₆ 6 = log ₀,₆ 10/6 = log ₀,₆ 0,6 = 1
log₂ 729 / log₂ 9 = log₂(9)³ / log₂ 9= 3log₂ 9 / log₂ 9 = 3
log₉ 8 / log₈₁ 8 = log₉ 8 / (1/2)*log₉ 8 = 2