2log3= a dan 3log5= b nilai 5log15=..

²log 3 = a
³log 5 = b

5'log 15
= ³log 15 / ³log 15
= (³log (3 × 5)) / ³log 15
= (³log 3 + ³log 5) / (³log 5)
= (1 + b)/b

jawab

2'log 3 = a
3'log 5 = b

2'log 3 . 3'log 5 = a b
2'log 5 = a b

5'log 15 = 2'log 15 / 2'log 5

= (2'log 3 + 2'log 5)  / (2'log 5)

=  (a + ab)/(ab)

= a (1 + b)/ a( b)

= (1 + b) /(b)