m^2+m-1=0
m^2+m=1
m^3+2m^2+2007
=m(m^2+m)+m^2+2007
=m+m^2+2007
=1+2007
=2008我是求m^2+2m^2+2007,不是m^3+2m^2+2007题目一定是m^3+2m^2+2007
否则m^2就合并了可能我抄错题目了，谢谢你的回答！