Tentukan rumus suku ke-n dan suku ke-10 dari barisan 1/125,1/5,1,5,....???????.... Question from @BestHack

September 2018 2 26 Report

ekamiaww 1/125, 1/25, 1/5, 1, 5, ... --> barisan geometri
a = 1/125
r = 5

$U_n=ar^{n-1} \\ U_n= \frac{1}{125}.5^{n-1} \\ U_n= \frac{1}{125} .5^n. \frac{1}{5} \\ U_n= \frac{5^n}{625} \\ \\ U_{10}=\frac{5^{10}}{625} \\ U_{10}=\frac{5^{10}}{5^4} \\ U_{10}=5^6=15625$

semoga membantu ya :)

0 votes Thanks 3

okymarkianto Mungkin soal yg benar ini
1/125 , 1/25 , 1/5 , 1 , 5 , ...
geometri
a=1/125
r=U2 / U1 = 5
$U_n=ar^{n-1}=( \frac{1}{125})(5^{n-1})=( \frac{1}{5^3})(5^{n-1})=(5^{-3})(5^{n-1})=5^{n-4}$

$U_{10}=5^{10-4}=5^6=sekian$

0 votes Thanks 0

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