1-2+3-4+5-6+...-2002+2003-2004
问题描述:
1-2+3-4+5-6+...-2002+2003-2004
答
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你确定确定