Page 19 - FLIPBOOK MATEMATIKA BARISAN DAN DERET

2
1 1 1 1
= ( ) = ( ) ( ) =
2
2
4
2
2
1 3 1 1 1 1
= ( ) = ( ) ( ) ( ) =
3
2 2 2 2 8
1 4 1 1 1 1 1
= ( ) = ( ) ( ) ( ) ( ) = 16
4
2
2
2
2
2

1 1 1 1
Jadi barisannya adalah , , ,
2 4 8 16

b) Suku Ke 5 adalah
5
1 1 1 1 1 1 1
= ( ) = ( ) ( ) ( ) ( ) ( ) = 32
5
2
2
2
2
2
2

Suku Ke 7 adalah
1 7 1 1 1 1 1 1 1 1
= ( ) = ( ) ( ) ( ) ( ) ( ) ( ) ( ) = 128
7
2
2
2
2
2
2
2
2

Contoh 6
Hitunglah n jika :
n

a) U = 3 + 3 = 30
n
2

b) U = n + 1 = 17
n
Jawab :
n

a) Un = 3 + 3 = 30
n

3 = 30 – 3
n

3 = 27
n
3

3 = 3
n = 3
2
b) U = n + 1 = 17
n
2

n = 17 – 1
2

n = 16

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