楼上两位的答案是错的,x^n=3,那么设x=3,n=1即可知道他们是错的.[(3x)^(3n)]/[x^(2n)]=[(3)^(3n)*(x)^(3n)]/[(x^n)^2]=[(3^3)^n * (x)^(3n)]/[(x^n)^2]=[27^n * (x^n)^3]/[(x^n)^2]=[27^n * 3^3]/[(x^n)^2]=[27^n*27]...