2log 25 X 3log 8 X 5log 9 =

² log 25 × ³log 8 × 5 log 9 = ² log 25 × 5 log 9 × ³log 8

= ² log 5² × 5 log 3² × ³log 2³
= 2 × ² log 5 × (2) 5 log 3 × (3) ³log 2
= (2×2×3) × ² log 5 × 5 log 3 × ³log 2
Ingat sifat
a log b × b log c = a log c
Maka,
= 12 × ² log 2
Ingat sifat
a log a = 1
Maka,
= 12×1 = 12

Semoga membantu, kalau bener jadikan terbaik ya. Tq :)