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Kelas : IX
Bab : Barisan dan Deret
7) Pembahasan ada pada gambar...
8)
0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29
9)
2,4,6,8,10,12,14,16,18,20,22,24,25,26,28,30,32,34,36,38,40,42,44,46,48
10)
1,3,5,7,9,11,13,15,17,19,21,23,25,27,29,31,33,35,37,39,41,43,45,47,49,51,53,55
Note :
a = suku pertama
b = beda
r = rasio
Rumus :
(ARITMATIKA)
Beda = U2 - U1
Un = a + (n - 1)b
Sn = n/2 (2a + (n - 1)b)
(GEOMETRI)
Rasio = U2/U1
Un = a.r^(n - 1)
Sn = a(1 - r^n)/(1 - r)
Sn = a(r^(n) - 1)/(r - 1)