2 log 3=p dan 3 log 5=q maka 15 log 20=

LogAritMa

²log 3 = p
³log 5 = q

15'log 20
= ³log 20 / ³log 15
= ³log (2² × 5) / ³log (3 × 5)
= (2 . ³log 2 + ³log 5) / (³log 3 + ³log 5)
= (2/p + q) / (1 + q)
= (2 + pq) / p(1 + q)
= (2 + pq) / (p + pq) ✔