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SraAzevedo
@SraAzevedo
December 2019
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1.Determine ɑ fórmulɑ do termo gerɑl de cɑdɑ PG:
ɑ) (2,8...)
B) (3,9...)
C) (2,1...)
Obs.: Necessito dɑ explicɑção
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DanielS6
A)
PG (2, 8...)
a1 = 2
q = 8/2 = 4
an = a1 . qⁿ⁻¹
an = 2 . 4ⁿ⁻¹
b)
PG (3, 9...)
a1 = 3
q = 9/3 = 3
an = a1 . qⁿ⁻¹
an = 3 . 3ⁿ⁻¹
c)
PG (2, 1)
a1 = 2
q = 1/2 = 0,5
an = a1 . qⁿ⁻¹
an = 2 . 0,5ⁿ⁻¹
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Thanks 0
eversonboy
Olá!!
PG ( 2,8,...)
A1 = 2
q = 4
podemos achar a razão dividindo 8 por 2
Temos que fórmula da PG é: An = A1.qⁿ⁻¹
Vamos trocar os valores que sabemos na fórmula:
An = 2.4ⁿ⁻¹
<<< Resposta (substituímos apenas A1 e q)
B)
PG( 3,9,...)
A1 = 3
q = 9/3 = 3
An = A1.qⁿ⁻¹
An = 3.3ⁿ⁻¹
<<< Resposta
C)
PG(2,1,...)
A1 = 2
q = 1/2 = 0,5
An = A1.qⁿ⁻¹
An = 2.0,5ⁿ⁻¹
Esse n-1 significa que se você quer encontrar o A15, por exemplo, você deve colocar o 14 no luga desse n-1. É um a menos do que vc quer encontrar
1 votes
Thanks 0
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Lista de comentários
PG (2, 8...)
a1 = 2
q = 8/2 = 4
an = a1 . qⁿ⁻¹
an = 2 . 4ⁿ⁻¹
b)
PG (3, 9...)
a1 = 3
q = 9/3 = 3
an = a1 . qⁿ⁻¹
an = 3 . 3ⁿ⁻¹
c)
PG (2, 1)
a1 = 2
q = 1/2 = 0,5
an = a1 . qⁿ⁻¹
an = 2 . 0,5ⁿ⁻¹
PG ( 2,8,...)
A1 = 2
q = 4
podemos achar a razão dividindo 8 por 2
Temos que fórmula da PG é: An = A1.qⁿ⁻¹
Vamos trocar os valores que sabemos na fórmula:
An = 2.4ⁿ⁻¹ <<< Resposta (substituímos apenas A1 e q)
B)
PG( 3,9,...)
A1 = 3
q = 9/3 = 3
An = A1.qⁿ⁻¹
An = 3.3ⁿ⁻¹ <<< Resposta
C)
PG(2,1,...)
A1 = 2
q = 1/2 = 0,5
An = A1.qⁿ⁻¹
An = 2.0,5ⁿ⁻¹
Esse n-1 significa que se você quer encontrar o A15, por exemplo, você deve colocar o 14 no luga desse n-1. É um a menos do que vc quer encontrar