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u9 = ar ^8 = 48
r^4= 48/27 = 16/9
r^2= 4 / 3
r = 2 /√3
u5 = ar^4 = 27
a . 16/9 = 27
a = 27 x 9/16
a= 27 x 9/16=243/16
u8= ar^7
= 243/16 x (2/√3)^7
= 243 x 8 / 27√3
= 9 x 8 /√3
=3.√3√3 x 8/ √3
= 3√3 x 8
=24√3 atau 41,57
U₉ = ar⁸ = 48
maaf kalo salah