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数学
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（-1+2-3+4.-97+98-99+100）的简便方法
人气：119 ℃ 时间：2019-12-26 09:15:13
解答
50啊.把两个看成一组,总得有50组.规律都是前一个加后一个等于一.所以是50
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用简便方法来计算100+99-98+97-96+.+3-2+1
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