①2008分之(2009×2007 + 1)
= 2008分之[(2008 + 1)×(2008 - 1) + 1]
= 2008分之[(2008^2 - 1) + 1]
= 2008
②1004的平方
= (1000 + 4)^2
= 1000^2 + 2 * 4 * 1000 + 4^2
= 1000000 + 8000 + 16
= 1008016