问题
填空题
2008+2007-2006+2005-2004+…+3-2+1=______.
答案
2008+2007-2006+2005-2004+…+3-2+1,
=2008+++…+(3-2)+1,
=2008+(2007-2+1)÷2×1+1,
=2008+1003+1,
=3012.
2008+2007-2006+2005-2004+…+3-2+1=______.
2008+2007-2006+2005-2004+…+3-2+1,
=2008+++…+(3-2)+1,
=2008+(2007-2+1)÷2×1+1,
=2008+1003+1,
=3012.