Ada Yang bsa 93 poin

a = 2^x = 3^y = 6^-z
²log a = x
³log a = y
6'log a = -z

1/x + 1/y + 1/z
= a'log 2 + a'log 3 - a'log 6
= a'log (2 × 3/6)
= a'log 1
= 0 / log a
= 0