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1. ³log 5 + ³log 2 + ³log 4 = ³log (5 x 2 x 4) = ³log 40
2. ²log 15 + ²log 14 - ²log 105 = ²log (15 x 14 : 105) = ²log 2 = 1
3.
3 . ³log2 + 2 . ³log 3 - ³log 24
= ³log 2³ + ³log 3² - ³log 24
= ³log 8 + ³log 9 - ³log 24
= ³log (8 X 9 : 24)
= ³log 3
= 1