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U3 = a.r pangkat 2=2
(A coret)
r pangkat 4 =16
r=2
A.2 pangkat 2 = 2
A.4 = 2
A=2/4
U9=2/4x2 pangkat 8
=2/4x256
=126
ar^2 = 2
= r^4 = 16
r = 2
a.4 = 2
a= 1/2
u9 = 0.5×2^8 = 123