1.) Tulislah 3 bilangan berikut A.2,4,6,10,12…. B.1,4,9,16,25…. C.50,42,34,26…. 2.) 10,15,20,25… Dari barisan aritmatika di atas tentukan U15 DAN U20

1.)
Tulislah 3 bilangan berikut
A.2,4,6,10,12….
B.1,4,9,16,25….
C.50,42,34,26….

2.)
10,15,20,25…
Dari barisan aritmatika di atas tentukan U15 DAN U20

Penjelasan dengan langkah-langkah:

1.

a. 2,4,6,10,12, 14, 16, 18

beda = 4-2 = 2

sehingga memiliki pola aturan +2

 

b. 1,4,9,16,25, 36, 49, 64

memiliki pola = n²

 

c. 50,42,34,26, 18, 10, 2

memiliki pola = -8

 

2.

10,15,20,25

 

b

= U2 – U1

= 15-10

= 5

 

un = a+(n-1)b

u15 = 10 + (15-1)5

u15 = 10 + 14(5)

u15 = 10 + 70

u15 = 80

 

U20 = 10 + (20-1)5

U20 = 10 + 19(5)

u20 = 10 + 95

U20 = 105

 

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