1-2+3-4+5-6+...-2002+2003-2004

来源：学生作业帮助网编辑：作业帮时间：2024/05/05 11:46:19

1-2+3-4+5-6+...-2002+2003-2004
1-2+3-4+5-6+...-2002+2003-2004

1-2+3-4+5-6+...-2002+2003-2004
1-2+3-4+5-6+...-2002+2003-2004
=(1-2)+(3-4)+(5-6)+...+(2001-2002)+(2003-2004)
=-1-1-1-1-.-1-1
=-1*1002
=-1002