....,1/2, 1, 2, 4, 8 Isi titik² nya?

Barisan Geometri

Rasio = U3/U2
= 1 / (1/2)
= 1 × 2/1
= 2

Dit a ?

U2 = ar
1/2 = a . 2
a = (1/2) / 2
a = 1/4

Mapel : Matematika
Kelas : IX SMP
Bab : Barisan dan deret

Pembahasan :
Perbandingan Rasio

U2/U1 = U3/U2
(1/2)/x = 1/(1/2)
(1/2)/x = 2
2x = 1/2
x = 1/4

Jawaban : 1/4