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Bab Barisan dan DeretMatematika SMP Kelas VIII
Geometri
r = ⁶⁻³√(4/9 : 12)
= ∛(4/9 x 1/12)
= ∛(1/27)
= 1/3
U2 = U3 : r
= 12 : 1/3
= 12 x 3/1
= 36