a^n+2 -18a ^n +81a^n-2.(n为正整数且n>2)分解因式 .

a^n+2-18a^n+81a^n-2 a^n+2-18a^n+81a^n-2(n>2且n为整数）因式分解 因式分解:a^n+2-18a^n+81a^n-2(n＞2且n为整数) a^n+2 -18a ^n +81a^n-2.(n为正整数且n>2)分解因式 . 求因式分解解题过程a^(n+2)-18a^n+81a^(n-2)= (a^n+b^n)(a^2n-a^n*b^n+b^2n) 设a,n∈N*证明a^2n-(-a)^n≥(a+1)×a^n a^n+2+a^n+1-a^n因式分解 a^n+1+a^n-1-2a^n因式分解 a^n+2+a^n+1-3a^n因式分解 因式分解:a^2n+18a^2b^n+81b^2n=? a^n+2-a^n的因式分解 因式分解:a^n+2-6a^n (a^n+1)-(a^n-2)等于 a^n+2-6a^n+5a^n-2(n>2且n为整数 求(n→∞)lim2^n-a^n/2^n+a^n(a≠-2) 求通项公式.a(n+1)=2a(n)+n 求极限,N趋向无穷,n^2 （(a+1/n)^(1/n)-a^(1/n)）n^2 *((a+1/n)^(1/n)-a^(1/n))