1-2+3-4+5-6+...-2002+2003-2004+2005-2006+2007=?
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/06 17:41:39
![1-2+3-4+5-6+...-2002+2003-2004+2005-2006+2007=?](/uploads/image/z/45475-43-5.jpg?t=1-2%2B3-4%2B5-6%2B...-2002%2B2003-2004%2B2005-2006%2B2007%3D%3F)
1-2+3-4+5-6+...-2002+2003-2004+2005-2006+2007=?
1-2+3-4+5-6+...-2002+2003-2004+2005-2006+2007=?
1-2+3-4+5-6+...-2002+2003-2004+2005-2006+2007=?
1-2+3-4+5-6+...-2002+2003-2004+2005-2才2003-2004)+(2005-2006)=-1-1-1-1.-1=-1003
-1003++2007=1004
1-2+3-4+5-6+...-2002+2003-2004+2005-2006+2007=(1-2)+(3-4)+(5-6)+...+(2005-2006)+2007
= (-1)*2006/2+2007 = -1003+2007 = 1004
1004,每两个放在一起
1-2+3-4+5-6+...-2002+2003-2004+2005-2006=(1-2)+(3-4)+(5-6)+...-2002)+(2003-2004)+(2005-2006)=-1-1-1-1。。。-1=-1003
-1003++2007=1004