Mtk wajib kelas 11 nomor 6
Jawaban Terkonfirmasi
Bab Barisan dan Deret
Matematika SMA Kelas X
Aritmatika
b = U2 – U1
= log (2/3) – log 2
= log ((2/3) . 1/2)
= log (1/3)
U10 = a + 9 . b
= log 2 + 9 . log (1/3)
= log (2 . 1/3⁹)
= log (2/3⁹)
Sn = (n/2) . (a + Un)
S10 = (10/2) . (log 2 + log (2/3⁹)
= 5 . (log (2 . 2/3⁹)
= 5 log (2²/3⁹)
= 5 (log 2² – log 3⁹)
= 5 . 2 log 2 – 5 . 9 log 3
= 10 log 2 – 45 log 3
jawabannya C