｛x | x＝2n＋1,

｛x | x＝2n＋1, x^(n)*x^(n+1)+x^(2n)*x 因式分解：(x^n+1)+(2x^n)+(x^n-1) x^n+1-2x^n+x^n-1因式分解 x^n-1-2x^n+x^n-1因式分解 分解因式x^n-x^(n-1)+x^(n-2) f(x)=e^x-x 求证(1/n)^n+(2/n)^n+...+(n/n)^n (-x)^3x^n-1+x^2n(-x)^3 x^n*x^n+1*(-x)^2n*x+(-x)^2n+3x^2n-2*x x^n-2x^n+1,因式分解 若(x^2+1/x)^n(n∈N+,n （－x）³×x^2n-1＋x^2n ×（－x）² 求和:1+x+x^2+.+x^n 1+x+x(x+1)+x(x+1)^2+.+x(x+1)^n (n为整数) (4x^n-2x^n-1-3x^n+2)÷（-5x^n-1) 计算(x^(2n)+x^n+1)(x^(3n)-x^(2n)+1) x^n-1(3x^n+4x^n+1-5x^n+2) 因式分解4x^(n+2)-9x^n+6x^(n-1)-x^(n-2)