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可以讀作:德爾塔(或代爾塔),英語中常用delta表示其發音,程序中也往往使用delta表示代表這個字母的變量.這個符號是希臘字母,是小寫字母,與其對應的大寫字母為Δ,位於第四,所以有時用於表示第四個事物.在數學中一般用於表示某數的增量(可正可負)
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