Jawabanmu

2014-09-12T20:29:30+07:00
2log12 = 2log3 + 2log4 = a+b
2log15 = 2log3 + 2log5 = a+c

2log12 + 2log15 = 2a + b + c
2014-09-12T20:29:44+07:00
2log12+2log15
=2log3+2log4+2log3+2log5
=a+b+a+c
=2a+b+c