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数学
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(10-55/2×1)+(9-55/2×2)+(8-55/2×3)+……+(1-55/2×10)
人气：244 ℃ 时间：2020-01-29 06:18:08
解答
首先1到10相加=49,再减去1到10相加后乘以2分之55,得负的2分之49乘53
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