Tentukan rumus suku ke-n dari barisan geometri berikut!a. 243, 81, 27,....b.1/81, -1/27, 1/9, -1/3.... Question from @Nurilizz

Nurilizz @Nurilizz

June 2019 2 25 Report

Tentukan rumus suku ke-n dari barisan geometri berikut!
a. 243, 81, 27,....
b.1/81, -1/27, 1/9, -1/3

Renggaanisa A. Un: a+(n-1).b
243+(n-1).3
243+1n.3
243+3n
maaf no 2. gk tau

1 votes Thanks 0

Nurilizz itu rumus barisan aritmatika

kharismamili
$a) \: a = 243 \\ r = \frac{81}{243} = \frac{1}{3} \\ un = a \times {r}^{n - 1} \\ un = 243 \times { \frac{1}{3} }^{n - 1} \\ un = 81 \times {1}^{n - 1} \\ \\ b)a = \frac{1}{81} \\ r = \frac{ \frac{ - 1}{27} }{ \frac{1}{81} } \\ r = - 3 \\ un = a {r}^{n - 1} \\ un = \frac{1}{81} \times { - 3}^{n - 1} = \\ \frac{1}{27} \times { - 1}^{n - 1}$
Maaf kalo salah

1 votes Thanks 2

About Us

Life Enjoy

" Life is not a problem to be solved but a reality to be experienced! "

Tentukan jumlah suku dari barisan geometri 45,15,5...5/27

Recommend Questions

Life Enjoy

Get in touch

Social