3x²-x=1、3x²=x+1
则:
9x^4+12x³-2x²-7x+2001
=(3x²)²+4x(3x²)-2x²-7x+2001
=(x+1)²+4x(x+1)-2x²-7x+2001
=x²+2x+1+4x²+4x-2x²-7x+2001
=3x²-x+2002
=2003
3x²-x=1、3x²=x+1
所以9x^4+12x³-2x²-7x+2001
=(3x²)²+4x(3x²)-2x²-7x+2001
=(x+1)²+4x(x+1)-2x²-7x+2001
=x²+2x+1+4x²+4x-2x²-7x+2001
=3x²-x+2002
=2003
楼上是专家啊。