m^2+m=1,则m^3+2m^2+2012=
问题描述：
m^2+m=1,则m^3+2m^2+2012=
答
m^3+2m^2+2012
=m^3+m^2+m^2+2012
=m(m^2+m)+m^2+2012
=m+m^2+2012
=1+2012
=2013