

Barisan Aritmatika
Presentation
•
Mathematics
•
11th Grade
•
Hard
SMAGA PEKALONGAN
FREE Resource
6 Slides • 1 Question
1
Barisan Aritmatika
Oleh :
Dina Oktaviana, S.Pd
2
Pengertian
Barisan Aritmatika adalah barisan yang selisih dua suku berurutan selalu tetap / sama.
Contoh :
a. 1, 4, 7, 10, ...
beda = b = 3
b. 30, 25, 20, 15, ...
beda = b = -5
3
Rumus mencari suku ke-n :
4
dari barisan tersebut, suku ke 10 adalah 37
1, 5, 9, 13, 17, 21, 25, 29, 33, 37
5
Setiap bulan pertambahan panjang rambut Lala adalah 2 cm sedangkan Lili 1 cm
Jadi rambut mereka akan sama panjang pada bulan keempat yaitu 11 cm
6
Penyelesaian dengan bentuk matematika
98, 95, 92, ...
b = 95 - 98 = -3
U20 = 98 + (20 - 1)(-3)
U20 = 98 + 19(-3)
U20 = 98 - 171
U20 = 73
7
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Barisan Aritmatika
Oleh :
Dina Oktaviana, S.Pd
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