Jawabanmu

2014-01-28T19:14:24+07:00
3log2= x , diubah jadi 2log3=1/x
2log5=y

5log15 = 2log15 / 2log5
= 2log 3 x 2log5 / 2log5
= 1/x + y / y
= ( y + xy /xy) / y
= y + xy / y(xy)
= y + xy / xy^2