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Jawaban Terkonfirmasi
19;
a = 4000
b = 2000
S24 = 24/2(2×4000 + (24-1)2000)
S24 = 12 (8000 + 46.000)
S24= 12x 54.000
S24= 648.000 (C)
20.
suku berikutnya
5 + 3 = 8
8 + 5 = 13
13 + 8 = 21
jawaban C
21.
U9 = 3(9²) + 9 = (3×81)+9 = 243 + 9 = 252
U5 = 3(5²)+ 5 = (3×25) + 5 = 75+5 = 80
U9 – U5 = 252 – 80 = 172 (A)
22.
a = 99
b = 93-99= -6
U22 = 99 + (22-1)(-6)
= 99 + (21x(-6))
= 99 – 126
= -27 (A)
23.
pola bilangan persegi panjang
Un = n(n+1)
U20 = 20(20+1)
= 20×21
= 420 (B)
24.
U7-U3 = 37-9
6b-2b = 28
4b = 28
b = 7
U3= 9
a + 2b = 9
a + 2×7 = 9
a + 14 = 9
a = -5
U30 = -5 + 29 x7 = -5 + 203 = 198 (A)
25.
2 jam = 120 menit
n = 120/20 = 6
15 + 30 + 60 + 120 + 240+ 480= 945
jawaban tidak ada di pilihan