U1 = a =5
U4= 5* r^4-1
40 = 5*r^3
40:5=r^3
8. =r ^3
2. =r
r. =2
Diketahui, a=5
r=2
Diketahui:
U1 = 5
U4 = a . r^3 = 40
Ditanyakan:
S6 = ... ?
Penyelesaian:
cari rasio
a . r^3 = 40
5 . r^3 = 40
r^3 = 8
r = 2
Sn = a (r^n - 1)/r - 1
S6 = 5 (2^6 - 1)/2 - 1
S6 = 5 (63)/1
S6 = 315
==================
Kelas: 9
Mapel: Matematika
Bab: Barisan dan Deret Bilangan
Kode: 9.2.2
Kata Kunci: Deret geometri
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Verified answer
U1 = a =5
U4= 5* r^4-1
40 = 5*r^3
40:5=r^3
8. =r ^3
2. =r
r. =2
Diketahui, a=5
r=2
Diketahui:
U1 = 5
U4 = a . r^3 = 40
Ditanyakan:
S6 = ... ?
Penyelesaian:
cari rasio
a . r^3 = 40
5 . r^3 = 40
r^3 = 8
r = 2
Sn = a (r^n - 1)/r - 1
S6 = 5 (2^6 - 1)/2 - 1
S6 = 5 (63)/1
S6 = 315
==================
Detil Jawaban
Kelas: 9
Mapel: Matematika
Bab: Barisan dan Deret Bilangan
Kode: 9.2.2
Kata Kunci: Deret geometri