Bantu lagi yaaa...........

9 log 25 . 5 log 2 - 3 log 54
= 3² log 5² . 5 log 2 - (3 log 9 + 3 log 3 + 3 log 2)
= 3 log 5 . 5 log 2 - (3 log 3² + 1 + 3 log 2)
= 3 log 2 - (2 + 1 + 3 log 2)
= 3 log 2 - 3 - 3 log 2
= -3

semoga membantu,,