1²-2²+3²-4²+...+2007²-2008²=
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/10 19:26:41
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1²-2²+3²-4²+...+2007²-2008²=
1²-2²+3²-4²+...+2007²-2008²=
1²-2²+3²-4²+...+2007²-2008²=
=-(1+2+3+.+2008)
=-2009x1004
(自己算吧)
不清楚就追问