Calcule a soma dos termos a5 e a7 de uma P. G cujo primeiro elemento é 8 e a razão e 2.
Soluções para a tarefa
Respondido por
4
Bom dia Daiane!
Solução!
![a1=8\\\\\
n=5\\\\\
q=2\\\\\
a5=?\\\\\\\\\\\
a5=a1.q^{n-1}\\\\\\
a5=8.2^{5-1} \\\\\
a5=8.2^{4}\\\\\
a5=8.16\\\\
\boxed{a5=128 }](https://tex.z-dn.net/?f=a1%3D8%5C%5C%5C%5C%5C%0An%3D5%5C%5C%5C%5C%5C%0Aq%3D2%5C%5C%5C%5C%5C%0Aa5%3D%3F%5C%5C%5C%5C%5C%5C%5C%5C%5C%5C%5C%0A%0Aa5%3Da1.q%5E%7Bn-1%7D%5C%5C%5C%5C%5C%5C%0Aa5%3D8.2%5E%7B5-1%7D+%5C%5C%5C%5C%5C%0Aa5%3D8.2%5E%7B4%7D%5C%5C%5C%5C%5C%0Aa5%3D8.16%5C%5C%5C%5C%0A%5Cboxed%7Ba5%3D128+%7D "a1=8\\\\\
n=5\\\\\
q=2\\\\\
a5=?\\\\\\\\\\\
a5=a1.q^{n-1}\\\\\\
a5=8.2^{5-1} \\\\\
a5=8.2^{4}\\\\\
a5=8.16\\\\
\boxed{a5=128 }")
![a1=8\\\\\
q=2\\\\\
n=7\\\\\
a7=?\\\\\\
a7=8.2^{7-1} \\\\\
a7=8.2^{6} \\\\\
a7=8.64\\\\
\boxed{a7=512}](https://tex.z-dn.net/?f=a1%3D8%5C%5C%5C%5C%5C%0Aq%3D2%5C%5C%5C%5C%5C%0An%3D7%5C%5C%5C%5C%5C%0Aa7%3D%3F%5C%5C%5C%5C%5C%5C%0Aa7%3D8.2%5E%7B7-1%7D+%5C%5C%5C%5C%5C%0Aa7%3D8.2%5E%7B6%7D+%5C%5C%5C%5C%5C%0Aa7%3D8.64%5C%5C%5C%5C%0A%5Cboxed%7Ba7%3D512%7D "a1=8\\\\\
q=2\\\\\
n=7\\\\\
a7=?\\\\\\
a7=8.2^{7-1} \\\\\
a7=8.2^{6} \\\\\
a7=8.64\\\\
\boxed{a7=512}")
![Soma=a5+a7\\\\\
Soma=128+512\\\\
Soma=640\\\\\
\boxed{Resposta:~~Soma=640}](https://tex.z-dn.net/?f=Soma%3Da5%2Ba7%5C%5C%5C%5C%5C%0ASoma%3D128%2B512%5C%5C%5C%5C%0ASoma%3D640%5C%5C%5C%5C%5C%0A%5Cboxed%7BResposta%3A%7E%7ESoma%3D640%7D "Soma=a5+a7\\\\\
Soma=128+512\\\\
Soma=640\\\\\
\boxed{Resposta:~~Soma=640}")
Bom dia!
Bons estudos!
Solução!
Bom dia!
Bons estudos!
Perguntas interessantes
Português,
9 meses atrás
Química,
9 meses atrás
Geografia,
9 meses atrás
Matemática,
1 ano atrás
Matemática,
1 ano atrás
Matemática,
1 ano atrás
Geografia,
1 ano atrás