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2log3 = a dan 2log5 = b
jadi a + b --> dalam logaritma perkalian bisa diubah ke dalam pertambahan
= 2 log 3 x 5
= 2 log 3 + 2 log 5
maka
2 log 3 = a
2 log 5 = b
2 log 15 = a + b