Tolong d bantu bgt secepatnya pake cara dgn rumus mtk kls 8
Jawaban:
B. 781
Penjelasan dengan langkah-langkah:
[Cari beda barusan nya]
U8 = a + 7b = 25
U5 = a + 4b = 16
______________ -
3b = 9
b = 3
[Cari suku pertama nya]
a + 4b = 16
a + 4(3) = 16
a + 12 = 16
a = 4
[Cari nilai dari jumlah 22 suku pertama]
Sn = n/2 × [2a + (n - 1) × b]
S22 = 22/2 × [2(4) + (22 - 1) × 3]
S22 = 11 × (8 + 21 × 3)
S22 = 11 × (8 + 63)
S22 = 11 × 71
S22 = 781
[answer.2.content]
