Matematika tolong bantu saya besok di kumpulanmatematika kls 8 pakek cara y poin nya Mayan lo ​

chelseysporerulv – April 03, 2023

tolong bantu saya besok di kumpulan
matematika kls 8 pakek cara y poin nya Mayan lo ​

Jawaban:

1.21,23

karena bilangan ganjil di mulai dari 15

1. 15, 17, 19, 21, 23, 24

2. a = 1 , b = 2 , n = 6
Sn = n/2 (2a + (n-1)b)
a. S6 = 6/2 (2(1) + (6-1) 2)
= 3 (3 + 5(2))
= 3 (3 + 10)
= 3 (13)
= 39
b. S25 = 25/2 (2(1) + (25-1) 2)
= 25/2 (2 + 24(2))
= 25/2 (2 + 48)
= 25/2 (50)
= 25 x 25
= 625

3. Un = n(n+1) / 2
a. n = 5
U5 = 5(5+1) / 2
= 5(6) / 2
= 30 / 2
= 15
b. n = 10
U5 = 5(10+1) / 2
= 5(11) / 2
= 55 / 2
= 27,5

4. Un = 91
Un = n(n+1) / 2
91 = n(n+1) / 2
91 x 2 = n^2 + n
182 = n^2 + n
n^2 + n - 182 = 0
(n - 13) (n + 14) =
n = 13 atau n = -14

5. Un = 1024
Un = 2^(n-1)
1024 = 2^(n-1)
2^10 = 2^(n-1)
n - 1 = 10
n = 10 + 1
n = 11

tolong jadikan terbaik [answer.2.content]