Deret geometri dengan u5 =16, u6 =8.nilai u1 +u2 +u3 +u4 =...
Matematika
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Pertanyaan
Deret geometri dengan u5 =16, u6 =8.nilai u1 +u2 +u3 +u4 =...
2 Jawaban
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1. Jawaban atnish
U5 = 16
ar^4 = 16
U6 = 8
ar^5 = 8
ar^5 / ar^4 = 8 / 16
r = 1/2
ar^4 = 16
a(1/2)^4 = 16
a(1/16) = 16
a = 256
S4 = a(1 - r^n) / 1 - r
S4 = 256 (1 - (1/2)^4) / 1 - 1/2
S4 = 256 - 16 / 1/2
S4 = 240 (2)
S4 = 480 -
2. Jawaban atiz
r = 8/16
= 1/2
U5 = ar^4 = 16
a = 16×16
= 256
S4 = (256×(1 - (1/2)^4) : ( 1 - 1/2)
= 240 : 1/2
= 480