3log 2=x dan 2log 5=y, maka 5log 15 adalah

Kelas 10 Matematika
Bab Logaritma

³log 2 . ²log 5 = xy
³log 5 = xy

⁵log 15 = (³log 15)/(³log 5)
⁵log 15 = (³log (5 . 3))/(xy)
⁵log 15 = (³log 5 + ³log 3)/(xy)
⁵log 15 = (xy + 1)/(xy)