观察下面的数列,找出规律并填空：
1,2,-3,-4,5,6,-7,-8,9,10,-11,-12,…,______(第1000个),…,______(第2009个),…
人气：445 ℃ 时间：2020-06-22 17:34:15
解答
每四项变一次正,++－－
1000/4=250
-1000
2009/4=502余1
2009
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