Matematika Sekolah Menengah Atas Tentu kan nilay suku ke 12 dari barisan aritmatikaa,2,7,12,17,22.....B,41,32,27,2013.....C,3,7,11,15,19......D,2,3½,5,6½,8.....C,9,0-9,-18,-27......

kellenaltenwerthulv – March 08, 2023

Tentu kan nilay suku ke 12 dari barisan aritmatika

a,2,7,12,17,22.....

B,41,32,27,2013.....

C,3,7,11,15,19......

D,2,3½,5,6½,8.....

C,9,0-9,-18,-27......

u(n) = a + ((n-1).b) → a = suku awal, b = beda, u(n) = suku ke-n

a. a = 2, b = +5

u12 = a + 11.b

= 2 + 11.5

= 2 + 55

= 57

b. a = 41, b = -7

u12 = a + 11.b

= 41 + 11.(-7)

= 41 + (-77)

= -36

c. a = 3, b = +4

u12 = a + 11.b

= 3 + 11.4

= 3 + 44

= 47

d. a = 2, b = +1½

u12 = a + 11.b

= 2 + 11.1½

= 2 + 16,5

= 18,5 atau 18 ½

e. a = 9, b = -9

u12 = a + 11.b

= 9 + 11.(-9)

= 9 + (-99)

= -90

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