因为：m^2+m-1=0所以，乘以m得到：m^3+m^2=mm^3+2m^2+2004=m^2+m+2004=1+2004=2005
m^3+2m^2 + 2004 = ( m^2 + m - 1 )( m + 1 ) + 2005 = 0 * ( m + 1 ) + 2005 = 2005
