1-2+3-4+5-6+···-2002+2003_数学解答

1-2+3-4+5-6+···-2002+2003

人气：425 ℃　时间：2020-02-09 14:05:42

解答

1-2+3-4+5-6+···-2002+2003
=(1-2)+(3-4)+(5-6)+···+(2001-2002)+2003
= 2003 -1-1-...-1
=2003 - 1001
=1002