由题意得
m²+m=1
m³+2m²-2007
=m【m²+m+m】-2007
=m【m+1】-2007
=m²+m-2007
=1-2007
=-2006m【m²+m+m】-2007怎么变成了m【m+1】-2007，能解释详细点吗已经求出m²+m=1，把m²+m=1代入m²+m+m就等于m+1了