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= ³log (52 x 18 : 12)
= ³log 78
B. ⁸log 18 = ³log 18 / ³log 8
= (³log 3² + ³log 2) / (³log 2³)
= (2 + (1/m)) / (3(1/m))
= (2m + 1)/3
¹²log 25 = ³log 25 / ³log 12
= (³log 5²) / (³log 2² + ³log 3)
= 2n / ((2/m) + 1)
= 2n / ((2 + m)/m)
= 2mn / (2 + m)