tlg jwab nomer 4, 5 dan 6 beserta caranya..trims

4] ......................... 1 .......................................

..................1 ......... 2 .......... 1 ........................

.........1 ......... 3 .......... 3 ................. 1 ...........

... 1 ....... 4 ........ 6 ........... 4 ............... 1 ....

1 .....5 ........ 10 ......... 10 ............. 5 ......... 1

(p + q)

= p⁵ + 5p⁴q + 10p³q² + 10p²q³ + 5pq⁴ + q⁵

a = 5

b = 10

2a - 3b

= 2 . 5 - 3 . 10

= 10 - 30

= -20

5] U2 - U1

= 7 - 4

= 3

U3 - U2

= 12 - 7

= 5

U4 - U3

= 19 - 12

= 7

Pola pada beda = +3, +5, +7, ...

Pola beda selanjutnya = +9, +11, +13, ...

U5 = U4 + b

U5 = 19 + 9

U5 = 28

U6 = U5 + b

U6 = 28 + 11

U6 = 39

Dua suku berikutnya adalah 28 dan 39

6] 20, 17, 14, 11, ...

b = U2 - U1

b = 17 - 20

b = -3

Un = -40

a + (n - 1) . b = -40

20 + (n - 1) . (-3) = -40

(n - 1) . (-3) = -40 - 20

n - 1 = -60/-3

n = 20 + 1

n = 21

Suku ke 21

Kelas 9

Pelajaran Matematika

Bab 6 Barisan dan Deret Bilangan

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