已知x^2-3x+1=0,求2x^3-3x^2-7x+2009

来源:学生作业帮助网 编辑:作业帮 时间:2024/11/14 15:16:15

已知x^2-3x+1=0,求2x^3-3x^2-7x+2009
已知x^2-3x+1=0,求2x^3-3x^2-7x+2009

已知x^2-3x+1=0,求2x^3-3x^2-7x+2009
2x^3-3x^2-7x+2009
=2x(x^2-3x+1)+3x^2-9x+2009
=2x*0+3x^2-9x+2009
=3x^2-9x+2009
=3(x^2-3x+1)+2006
=3*0+2006
=2006