diketahui 3log 5=p.Nilai 25log 81=……

³log5 = p

²⁵log81 = (³log81) / (³log25)
            = (³log3⁴) / (³log5²)
            = (4. ³log3) / (2. ³log5)
            = 4 / 2p
            = 2 / p