3 log 25 x 5 log 81 - 4 log 2

Kelas 10 Matematika
Bab Logaritma

^3log 25 . ^5log 81 - ^4log 2
= ^3log 81 . ^5log 25 - 1/(²log 4)
= ^3log 3^4 . ^5log 5² - 1/(²log 2²)
= 4 . ^3log 3 . 2 . ^5log 5 - 1/2
= 4 . 2 - 1/2
= 16/2 - 1/2
= 15/2
= 7 1/2