tulislah dua suku berikutnya dari masing masing barisan bilangan a.96,48,24,12 ...b.1,5,9,13...

Materi : Barisan dan Deret
Kelas : IX SMP
Kata kunci : Geometri naik , Aritmatika

=> 96 , 48 , 24 , 12 , ... ,...
awal ( a ) = 96
rasio ( r ) = 48/96 = 0,5

Un = a.r^n-1
U5 = 96 . (1/2)^5-1
U5 = 96 . 1/16
U5 = 96/16
U5 = 6

Un = a.r^n-1
U6 = 96. (1/2)^6-1
U6 = 96 . 1/32
U6 = 96/32
U6 = 3

=> 96 , 48 , 24 , 12 , 6 , 3 ( JAWABAN )

◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆

=> 1 ,5 , 9 , 13 , ... , ...
awal ( a ) = 1
beda (b) = 4

Un = U1 + (n - 1) b
U5 = 1 + (5-1) 4
U5 = 1 + 4.4
U5 = 1 + 16
U5 = 17

Un = U1 + ( n - 1)b
U6 = 1 + (6-1)4
U6 = 1 + 5.4
U6 = 1 + 20
U6 = 21

=> 1 , 5 , 9 , 13 , 17 , 21 ( JAWABAN )

Semoga membantu ... semangat ^_^