Tentukan suku ke 8 dan suku ke – n dari barisan aritmatika 2,5/5 3,7/5​

Jawaban:

barisan

2, 5/2, 3, 7/2

a = 2

b = 5/2 – 2 = 5/2 – 4/2 = 1/2

b = 1/2

U8 = a + 7b

U8 = 2 + 7(1/2)

U8 = 2 + 7/2 = 4/2 + 7/2

U8 = 11/2

Un = a + (n – 1)b

Un = 2 + (n – 1) x 1/2

Un = 2 + (1/2)n – 1/2

Un = (1/2)n + 3/2

Un = 1/2(n + 3)

Jawaban:

maap klo slah

Penjelasan dengan langkah-langkah:

barisan

2, 5/2, 3, 7/2

a = 2

b = 5/2 – 2 = 5/2 – 4/2 = 1/2

b = 1/2

U8 = a + 7b

U8 = 2 + 7(1/2)

U8 = 2 + 7/2 = 4/2 + 7/2

U8 = 11/2

Un = a + (n – 1)b

Un = 2 + (n – 1) x 1/2

Un = 2 + (1/2)n – 1/2

Un = (1/2)n + 3/2

Un = 1/2(n + 3)