Resposta :

[tex]a_5=a_2\cdot\,q^3\\\\\frac{1}{343}=1\cdot\,q^3\\\\\frac{1}{7^3}=q^3\\\\q=\sqrt[3]{\frac{1}{7^3}}\\\\\boxed{q=\frac{1}{7}}[/tex]

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