Tolong pake caranya :)
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Spesifikasi : Deret Geometri dan Aritmatika
Kelas : 8
50) A. 1280
51) A. 123
Langkah pengerjaan terlampir
50) r=2 bisa pake cara sederhana misal. U3=20 dan U6=160
20, 40, 80, 160 dikali 2 pake cara sederhana.
terus nyari a(suku pertama) 20 rasio mundur U3=20, U2=10, U1=5
Un=a.r^(n-1)
Un=5×2^(9-1)
Un=5×2^(8)
Un=5×256
Un=1280