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Verified answer
Kelas 8 MatematikaBab Barisan dan Deret Bilangan
^ = pangkat
r = U2/U1
r = 160/320
r = 1/2
Un = a . r^(n - 1)
U9 = 320 . (1/2)^8
U9 = 320 . 1/256
U9 = 5/4
Verified answer
Rasio ( r ) = Un / Un-1r = 160/320 = 0,5 atau 1/2
Un = a . r^( n - 1 )
Un = 320 . 1/2^ ( 9-1)
Un = 320 . 1/2^8
Un = 320 . 1/256
Un = 1,25 = 125/100 = 5/4 ( b )