2014-03-14
展开全部
3x^2-x-1=0
3x^2=x+1
9x^4+12x^3-3x^2-7x+1999
=(x+1)^2+12x^3-3x^2-7x+1999
=x^2+2x+12x^3+1-3x^2-7x+1999
=12x^3-2x^2-5x+2000
=4x(x+1)-2x^2-5x+2000
=2x^2-x=2000
和楼主给出的3x^2-x-1=0条件没法约
3x^2=x+1
9x^4+12x^3-3x^2-7x+1999
=(x+1)^2+12x^3-3x^2-7x+1999
=x^2+2x+12x^3+1-3x^2-7x+1999
=12x^3-2x^2-5x+2000
=4x(x+1)-2x^2-5x+2000
=2x^2-x=2000
和楼主给出的3x^2-x-1=0条件没法约
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