27^(2n+1)×3^5n÷81^(2n-1）=(3^3)^(2n+13^5n÷(3^4)^(2n-1)=3^(6n+3)×3^5n÷3^(8n-4)=3^(6n+3+5n-8n+4)=3^(3n+7)
麻烦采纳,谢谢!