2009 + 2008 + 2007 + 2006 + 2005 +2004 + 2003 +2002 + ...+3 +2 +1等于?

来源:学生作业帮助网 编辑:作业帮 时间:2024/05/14 12:47:03
2009 + 2008 + 2007 + 2006 + 2005 +2004 + 2003 +2002 + ...+3 +2 +1等于?

2009 + 2008 + 2007 + 2006 + 2005 +2004 + 2003 +2002 + ...+3 +2 +1等于?
2009 + 2008 + 2007 + 2006 + 2005 +2004 + 2003 +2002 + ...+3 +2 +1等于?

2009 + 2008 + 2007 + 2006 + 2005 +2004 + 2003 +2002 + ...+3 +2 +1等于?
2009 + 2008 + 2007 + 2006 + 2005 +2004 + 2003 +2002 + ...+3 +2 +1
=(2009+1)×2009÷2
=2019045

2009 + 2008 + 2007 + 2006 + 2005 +2004 + 2003 +2002 + ... +3 +2 +1
=2009+(2008+1)×1004
=2009+2009×1004
=2009×1005
=2017036