x^5-x^4+x^3-x^2+x-1

问题描述:

x^5-x^4+x^3-x^2+x-1

x^5-x^4+x^3-x^2+x-1
=(x^5-x^4)+(x^3-x^2)+(x-1)
=x^4(x-1)+x^2(x-1)+(x-1)
=(x-1)(x^4+x^2+1)

χ^ 5 - χ^ 4 +χ^ 3 - χ^ 2 + x-1的
= ^ 4(x-1的)+χ^ 2(x-1的)+(x-1的) =(X-1)(x ^ 4 + x ^ 2 +1)
=(X-1)(x ^ 4 +2 x ^ 2 +1 X ^ 2)
=( X-1)(x ^ 2 +1)^ 2-x ^ 2]
=(X-1)(x ^ 2 +1 + X)(X ^ 2 +1 X)

先分组,前三项和后三项,再对前三项提公因式x^3 再继续提公因式:x^2-x+1,然后对x^3-1利用立方差公式即可。结果为:(x-1)(x^2-x+1)(x^2+x+1)

x^5-x^4+x^3-x^2+x-1
=x^4(x-1)+x^2(x-1)+x-1
=(x-1)(x^4+x^2+1)



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  x^5-x^4+x^3-x^2+x-1
  =x^4(x-1)+x^2(x-1)+(x-1)
  =(x-1)(x^4+x^2+1)
  =(x-1)(x^4+2x^2+1-x^2)
  =(x-1)[(x^2+1)^2-x^2]
  =(x-1)(x^2+1+x)(x^2+1-x)


x^5-x^4+x^3-x^2+x-1
  =x^4(x-1)+x^2(x-1)+(x-1)
  =(x-1)(x^4+x^2+1)
  =(x-1)(x^4+2x^2+1-x^2)
  =(x-1)[(x^2+1)^2-x^2]
  =(x-1)(x^2+1+x)(x^2+1-x)