若x2+3x-2=0,则2x3+6x2-4x的值为______.
若x2+3x-2=0,则2x3+6x2-4x的值为______.
已知x2-x-1=0,则-x3+2x2+2005的值为______.
已知x2+x-1=0,则x3-2x+4的值为______.
已知x2+x-1=0,则代数式x3+2x2+2008的值为______.
若x2+3x-2=0,则x3+5x2+4x+18=______.
若x2+x-2=0,则x3+2x2-x+2007=______.
如果x2+3x-3=0,则代数式x3+5x2+3x-10的值为______.
若代数式x2+2x-4=0则代数式x3+2x2-4x+2010的值为
若x=-1,则代数式x3-x2+4的值为______.
证明:(x3+5x2+4x-1)-(-x2-3x+2x3-3)+(8-7x-6x2+x3)的值与x无关.
x2-x-1=0,则2x3+7x2-11x+2012=______.
要使x(x2+a)+3x-2b=x3+5x+4成立,则a和b的值分别为______.