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a = 8/r
a = 8/2
a = 4
64 = a.r(pangkat)4
64 = 8/r . r(pangkat)4
r(pangkat)3=64/8
r(pangkat)3=8
r = 2
U8 = a.r(pangkat)7
4.2x2x2x2x2x2x2
4.128
= 512