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单词 summation
释义 summation

Adding up a number of items. The sum of all xi, i = 1, 2,…, N is written using the Greek letter sigma, upper case, as 0198607679.summation.1.jpg , or, where the range of i is thought to be obvious,S = ∑i xi.

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更新时间:2025/5/1 20:03:03