hasil dari (2/3) pangkat -4 + (1/2) pangkat -2 =... pake cara yahhh, thanks

(2/3)^-4 + (1/2)^-2 = 1 : (2/3)^4 + 1: (1/2)^2
= 1 : (16/9) + 1: (1/4) = (9/16) + (4/1) = 73/16