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The sum of all the integers k such that –26 < k < 24 is
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K的集合为-25,-24,-23......0,1,2.......23 以0为界限，一共25+24=49 个数
两两相对相加为O,最后剩下-25，-24，相加就是-49
Gu777777
不包括-26，24不要看错了
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2019-04-05 13:39:43
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