Question

Tentukan rasio setiap barisan geometri berikut ini
a) 1/12, 1/4, , 9/4, ...
b) 20, 10, 5, ...
c) 7, 7/2, 7/4, 7/8
d) 1, 2, 4, 8, ...
tentukan suku yang diminta dari barisan geometri berikut ini.
a) 100, 20, 4, 4/5, ..., U₆
b) 1, 5, 25, 125, ..., U₈
c) 6, 18, 54, 162, ..., U₇

Pakai cara yaa

Answer 1

Nomor 1
a) 1/12, 1/4, , 9/4, ...
r = 1/4 : 1/12
r = 1/4 x 12/1
r = 3

b) 20, 10, 5, ...
r = 10/20
r = 1/2

c) 7, 7/2, 7/4, 7/8
r = 7/2 : 7
r = 7/2 x 1/7
r = 1/2

d) 1, 2, 4, 8, ...
r = 2/1
r = 2

Nomor 2
a) 100, 20, 4, 4/5, ...
r = 20/100
r = 1/5

Sehingga :
U₆ =
U₆ =
U₆ =
U₆ =


b) 1, 5, 25, 125, ...
r = 5/1
r = 5

Sehingga :
U₈ =
U₈ =
U₈ =


c) 6, 18, 54, 162, ...
r = 18/6
r = 3

Sehingga :
U₇ =
U₇ =
U₇ =
U₇ =