deret aritmetika 0+7+14+21+... tentukan Sn dan S20
Matematika
chey4
Pertanyaan
deret aritmetika 0+7+14+21+... tentukan Sn dan S20
1 Jawaban
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1. Jawaban arinaheriyanti
Diket:
a = 0
b = 7-0 = 7
Sn = n/2 (2a +(n-1)b)
Sn = n/2 ((n-1)7)
Sn = n/2 (7n - 7)
S20 = 20/2 (2(0) + (20-1)×7)
S20 = 10 (19 × 7)
S20 = 10 × 133
S20 = 1330
semoga membantu ^__^