27^(n+1)*9^n/3^(5n)=3^(3n+3)*3^(2n)/3^(5n)=3^(3n+3+2n-5n)=3^3=27
27的n+1次方x9的n次方÷3的5n次方=3的3（n+1）次方x3的2n次方÷3的5n次方=3的[3(n+1)+2n-5n]次方=3的3次方=27
等于27
