Suatu barisan aritmatika diketahui U1 +U3+U5=30 dan U2+U4+U6=39.suku ke-51 barisan tersebut adalahh

U1 + U3 + U5 = 30
a + a + 2b + a + 4b = 30
3a + 6b = 30
a + 2b = 10

U2 + U4 + U6 = 39
a + b + a + 3b + a + 5b = 39
3a + 9b = 39
a + 3b = 13

a + 3b = 13
a + 2b = 10
__________ (-)
b = 3

a + 2b = 10
a + 2.3 = 10
a + 6 = 10
a = 4

U51 = a + 50 b
U51 = 4 + 50.3
U51 = 4 + 150
U51 = 154

Semoga bisa bantu ya