3log15 - 3log5 - 3log1/81

3log15-3log5-3log1/81
= 3log(15:5)-3log3 pangkat -4
= 3log3-4
= 1-4
= -3

3log 15-3log5-3log1/81
=3log(15/3/(1/81)
=3log3/(1/81)
=3log243
=3log3 pangkat5
=5
semoga membantu!