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问题: X四次方+2001x平方+2000x+2001

解答:

 x^4 + 2001x² + 2000x + 2001
= x^4 - x + 2001x² + 2001x + 2001
= x(x³-1) + 2001(x²+x+1)
= x(x-1)(x²+x+1) + 2001(x²+x+1)
= (x^²+x+1)[x(x-1)+2001]
= (x²+x+1)(x²-x+2001)