Question

1+2+3+4+5+6+.2000+2001+2002+2003+2004+2005+2006+2007求简便运算

Answer 1

1+2+3+4+5+6+.2000+2001+2002+2003+2004+2005+2006+2007

=(1+2007)+(2+2006)+……+(1003+1005)+1004

=2008x1003+1004

=2014024+1004

=2015028