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Kelas 8 MatematikaBab Perbandingan dan Aritmatika Sosial
4a] 2, 8, 14, ... → semua ditambah 6
2, 8, 14, 16, 20, 26, ...
Seharusnya, 2, 8, 14, 20, 26 → 6 dihilangkan
4b 91, 84, 77, 71, 63, 56, ...→ berkurang 7
Seharusnya 91, 84, 77, 70, 63, 56 → 71 diubah menjadi 70
4c] 2, 4, 8, 10, 16, 32, ... → dikali 2
Seharusnya 2, 4, 8, 16, 32 → 10 dihilangkan
4d] 1, 8, 9, 27, 64, 125, .. → n³
Seharusnya 1, 8, 27, 64, 125 → 9 dihilangkan
5a] kurang lengkap
5b] 2, 6, 18, 54
r = U2/U1
r = 6/2
r = 3
2 suku berikutnya
U5 = U4 . r
U5 = 54 . 3
U5 = 162
U6 = U5 . r
U6 = 162 . 3
U6 = 486
2 suku berikutnya 162 dan 486
c] b = U2 - U1
b = 57 - 60
b = -3
U5 = U4 + b
U5 = 51 - 3
U5 = 48
U6 = U5 + b
U6 = 48 - 3
U6 = 45
2 suku berikutnya adalah 48 dan 45