tolong dong 3log25 . 5log81 : 2log16

(log 25/log 3).(log 81/log 5) : ²log 2⁴
=(log 5²/log 3)(log 3⁴/log 5) : 4
=(2 log 5/log 3)(4 log 3/log 5) : 4
= 8 : 4 = 2
Pakai rumus a log b = log b/log a