Question

已知m^+m-1=0,求m^3+2m^2-2009=?

Answer 1

可知 m^2+m=1

m^3+2m^2-2009 化简得：

m^3+m^2+m^2-2009

=m*(m^2+m)+m^2-2009

=m+m^2-2009

=1-2009

=-2008