ada yang tau caranya??...

semoga jawaban membantu

(1/4)^x. (1/4)^2 = (8^2x)^1/3. (8^-1)^1/3
(1/4)^x.(1/4)^2= 8^2x/3/ 8^1/3
(1/4)^x.1/16 = 8^2x/3 / 8^1/3
2^-2x.2^-4= (2^3)^2x/3 / (2^3)^1/3
2^-2x-4 = 2^ 2x-1
-2x-4=2x-1
-2x-2x= -1+4
-4x = 3
x = -3/4
jadi 81^-3/4 = (3^4)^-3/4
= 3^-3
=1/27 E