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[数学] 2007-11-21

2007-11-21

分解因式X^8+X^6+X^4+X^2+1.

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(x^8+x^6+x^4+x^2+1)
=(x^2-1)(x^8+x^6+x^4+x^2+1)/(x^2-1)
=(x^10-1)/(x^2-1)
=(x^5+1)(x^5-1)/(x^2-1)
=(x+1)(x^4-x^3+x^2
-x+1)(x-1)(x^4+x^3+x^2+x+1)/(x^2-1)
=(x^4-x^3+x^2-x+1)(x^4+x^3+x^2+x+1)
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