问题
填空题
已知x2+x-1=0,则x3+2x2+2011=______.
答案
∵x2+x-1=0,
∴x3+2x2+2011
=x(x2+x-1)+(x2+x-1)+2012
=2012.
故答案为2012.
已知x2+x-1=0,则x3+2x2+2011=______.
∵x2+x-1=0,
∴x3+2x2+2011
=x(x2+x-1)+(x2+x-1)+2012
=2012.
故答案为2012.