Question

determine o quinto termo da p.g (10,4,8/5)

Answer 1

$a1 = 10\\\\q = \frac{a2}{a1} = \frac{4}{10} = 0,4\\\\a5 = 10.(0,4)^{5 - 1} = 10.(0,4)^4 = 10.0,0256 = 0,256 = \frac{256^{:8}}{1000^{:8}} = \frac{32}{125}$

Resposta: $a5 = \frac{32}{125}$

Espero ter ajudado!