.在有理数范围内分解因式x^{12}+x^9+x^6+x^3+1.

问题描述:

.在有理数范围内分解因式x^{12}+x^9+x^6+x^3+1.

x^{12}+x^9+x^6+x^3+1=(x^3-1)(x^12+x^9+x^6+x^3+1)/(x^3-1)=(x^15-1)/(x^3-1)=(x^5-1)(x^10+x^5+1)/(x^3-1)=(x-1)(x^4+x^3+x^2+x+1)(x^10+x^5+1)/(x^3-1)=(x^4+x^3+x^2+x+1)(x^11-x^10+x^6-x^5+x-1)/(x^3-1)其中x^1...