计算1-2+3-4+5-6+7-8·····+2007-2008的值,大家帮我解答下,谢谢
问题描述:
计算1-2+3-4+5-6+7-8·····+2007-2008的值,大家帮我解答下,谢谢
答
(1-2)+(3-4)+……+(2007-2008)
一共1004对 所以结果是 -1004
答
两两组合,-1004?
答
1-2+3-4+5-6+7-8·····+2007-2008
=(1-2)+(3-4)+...+(2007-2008)
=-1-1-...-1
=-1*1004
=-1004
答
1005