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ar⁵ = 9
U₉ = 243
ar⁸ = 243
ar⁵ . r³ = 243
9r³ = 243
r³ = 27
r = 3
ar⁵ = 9
a (3)⁵ = 9
243a = 9
a = 9/243
a = 1/27
U₃ = ar²
= 1/27 x 3²
= 1/27 x 9
= 1/3
maaf ya kalo salah ^_^