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Dani76561
@Dani76561
December 2019
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A seqüência (3/8, a,...)é uma progressão geométrica (PG). O oitavo
termo desta progressão é igual a 48. Então o valor de “a” é:
a)2 b)3/4 c)3 d)-3/4 e)-2
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ollo
Verified answer
An=a1.q^(n-1)
q=a2/a1
q=a/(3/8)
q=a.8/3
q=8a/3
a8=48
48=3/8.(8a/3)^(8-1)
48.8/3=(8a/3)^7
128=(8^7/3^7)a^7
2^7=(8^7/3^7)a^7 (radical índice 7)
2=8/3.a
a=2.3/8
a=6/8 simplificando por 2
a=3/4
Alternativa "b".
2 votes
Thanks 4
Dani76561
Muito obrigada Ollo!!!!!
ollo
Por nada. Disponha.
ollo
Obrigado pela escolha.
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Verified answer
An=a1.q^(n-1)q=a2/a1
q=a/(3/8)
q=a.8/3
q=8a/3
a8=48
48=3/8.(8a/3)^(8-1)
48.8/3=(8a/3)^7
128=(8^7/3^7)a^7
2^7=(8^7/3^7)a^7 (radical índice 7)
2=8/3.a
a=2.3/8
a=6/8 simplificando por 2
a=3/4
Alternativa "b".