27log 125 x 25log 1/64 x 64log 1/9

27log 125 x 25log 1/64 x 64log 1/9
= 27log1/9×25log125×64log1/64
= (3³)log(3~²)×(5²)log(5³)×64¹log(64~¹)
= -2/3×3/2× -1/1
=1