(2007-1)+(2006-2)+(2005-3)+……+(1005-1003)

分类: 作业答案 • 2021-12-19 11:35:04

问题描述：

答

2007-1)+(2006-2)+(2005-3)+……+(1005-1003)
=(2007-1003)+(2006-10022)+(2005-1001)+……+(1005-1)
=1004×1003
=1007012

答

=2006+2004+2002+……+2
=1003×（2006+2）÷2
=10的6次方+7007

答

(2007-1)+(2006-2)+(2005-3)+……+(1005-1003)
=(2007-1003)+(2006-10022)+(2005-1001)+……+(1005-1)
=1004×1003
=1007012