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3^(8n)=2 9^(-n-1)×27^(-2n) =3^[2(-n-1)]×3^[3(-2n)] =3^[2(-n-1)+3(-2n)] =3^(-8n-2) =1/3^(8n+2) =1/[3^(8n)×3^2] =1/(2×9) =1/18
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