U5 = a + (5 - 1) b
31 = a + 4b
U9 = a + (9 - 1)b
59 = a + 8b
a + 4b = 31
a + 8b = 59
_________ -
-4b = -28
b = 7
b = 7, maka
a + 4(7) = 31
a + 28 = 31
a = 3
U12 = a + (12 - 1) b
= 3 + 11 . 7
= 3 + 77
= 80
Semoga membantu
- @Keken
Diketahui:
U5 = a + 4b = 31
U9 = a + 8b = 59
Ditanyakan:
U12 = ... ?
Penyelesaian:
beda barisan
8b - 4b = 59 - 31
4b = 28
suku pertama
a + 8 (7) = 59
a + 56 = 59
U12 = a + 11b
U12 = 3 + 11 (7)
U12 = 3 + 77
U12 = 80
==================
Kelas: 9
Mapel: Matematika
Bab: Barisan dan Deret Bilangan
Kode: 9.2.2
Kata Kunci: Barisan aritmatika
" Life is not a problem to be solved but a reality to be experienced! "
© Copyright 2013 - 2024 KUDO.TIPS - All rights reserved.
Verified answer
U5 = a + (5 - 1) b
31 = a + 4b
U9 = a + (9 - 1)b
59 = a + 8b
a + 4b = 31
a + 8b = 59
_________ -
-4b = -28
b = 7
b = 7, maka
a + 4b = 31
a + 4(7) = 31
a + 28 = 31
a = 3
U12 = a + (12 - 1) b
= 3 + 11 . 7
= 3 + 77
= 80
Semoga membantu
- @Keken
Diketahui:
U5 = a + 4b = 31
U9 = a + 8b = 59
Ditanyakan:
U12 = ... ?
Penyelesaian:
beda barisan
8b - 4b = 59 - 31
4b = 28
b = 7
suku pertama
a + 8b = 59
a + 8 (7) = 59
a + 56 = 59
a = 3
U12 = a + 11b
U12 = 3 + 11 (7)
U12 = 3 + 77
U12 = 80
==================
Detil Jawaban
Kelas: 9
Mapel: Matematika
Bab: Barisan dan Deret Bilangan
Kode: 9.2.2
Kata Kunci: Barisan aritmatika