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Kelas 8 MatematikaBab Barisan dan Deret Bilangan
8] b = (U9 - U4)/(9 - 4)
b = (28 - 13)/5
b = 15/5
b = 3
a = U4 - 3b
a = 13 - 3 . 3
a = 13 - 9
a = 4
Sn = n/2 . (2a + (n - 1) . b)
S20 = 20/2 . (2 . 4 + 19 . 3)
S20 = 10 . (8 + 57)
S20 = 10 . 65
S20 = 650
9] a = 1 lembar
r = 2
S5 = ?
Sn = 1 . (rⁿ - 1) / (r - 1)
S5 = 1 . (2⁵ - 1) / (2 - 1)
S5 = (32 - 1)/1
S5 = 31 lembar