3 log 25 . 1/5 log 81 - 8 log 1/64

Bab Logaritma
Matematika SMA Kelas X

^ = pangkat

^3log 25 . ^(1/5)log 81 - ^8log (1/64)
= ^3log 81 . ^(5^(-1))log 25 - ^8log 8^(-2)
= ^3log 3^4 . ^(5^(-1))log 5² - (-2) . ^8log 8
= 4 . (2/-1) + 2
= -8 + 2
= -6

log 25/log 3.log 81/log (1/5) - 8log (1/8)^2
log 5^2/log 3. log 3^4/log 5^-1 -8log 8^-2
= 2log 5/log 3.4log 3/-1.log 5 - -2
= 2.4/ -1 + 2
= -8 + 2
= -6