
Barisan dan deret aritmetika
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Mathematics
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1st Grade
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Hard
Hasrawati Hasrawati
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Barisan dan Deret Aritmetika
Materi SMA/SMK Kelas X Semester Genap
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A. Barisan Aritmetika
1. Defenisi barisan aritmetika
Barisan aritmetika adalah barisan bilangan yang memiliki pola yang tetap. setiap urutan suku memiliki beda atau selisih yang sama. selisih disimbolkan dengan b
3
2. Rumus suku ke-n barisan aritmetika
Diketahui barisan bilangan
U1, U2, U3, U4, ..., Un
U1 = a; dimana U2 - U1 = b
U2 = a + b
U3 = (a + b) + b = a + 2b
Un = a + (n - 1).b
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dik a = 10 dan b = 13 - 10 = 3
Un = a + (n-1) b
U12 = 10 + (12 - 1) 3
U12 = 10 + 11 . 3
U12 = 10 + 33 = 43
Penyelesaian
Diketahui barisan aritmetika sebagai berikut:
10, 13, 16, 19, 22, 25, ...
Tentukan suku ke-12 barisan tersebut!
Contoh
Soal
5
Latihan
Tentukan suku ke-10 dari barisan:
1, 3, 5, 7, 9, 11, ...
Barisan dan Deret Aritmetika
Materi SMA/SMK Kelas X Semester Genap
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