Jawabanmu

2014-09-04T20:22:31+07:00
Log 2 = a dan log 3 = b

=> log 72 = log 3 x 3 x 2 x 2 x 2
=> log 3 + log 3 + log 2 + log 2 + log 2
=> b + b + a + a + a
=> 2b + 3a
2014-09-04T20:43:51+07:00
Log 72 = log 9x8 = log 9 + log 8 = log 3^2 + log 2^3 = 2xlog3 + 3xlog 2 = 2b + 3a
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