6x^n+1-14x^n+8x^n-1,(x+3)^2-2(x+3)-8与(2x-1)(3x+2)-20,ab(c^2+d^2)+cd(a^2+b^2)因式分解

6x^n+1-14x^n+8x^n-1因式分解 f(x)=e^x-x 求证(1/n)^n+(2/n)^n+...+(n/n)^n x^(n)*x^(n+1)+x^(2n)*x 因式分解4x^(n+2)-9x^n+6x^(n-1)-x^(n-2) 因式分解4x^n+2-9x^n+6x^n-1-x^n-2 若(x^2+1/x)^n(n∈N+,n 因式分解-6x^n+8x^n-1 因式分解2x^n-6x^n-1-8x^n-2 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) x^n-2x^n+1,因式分解 6x的n+1次方-14x的n次方+8x的n-1次方因式分解 6x的n+1次方-14x的n次方+8x的n-1次方,急求答案 x^n*x^n+1*(-x)^2n*x+(-x)^2n+3x^2n-2*x 约分(x^n+2)+(x^n+1)-6x^n/(2x^n+1)+5x^n-(3x^n-1) 4x^n+2-9x^n+6x^n-1-x^n-24x^(n+2)-9x^n+6x^(n-1)-x^(n-2),n是整数且大于2