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等差数列 / とうさすうれつ : n 1）arithmetic progression
等比数列 / とうひすうれつ : n 1）geometric progression
等差 / とうさ : n 1）(equal) difference
等差級数 / とうさきゅうすう : n 1）arithmetic series
等呼 / とうこ : n 1）denghu (phonetic method of classifying Chinese finals)
等吸収点 / とうきゅうしゅうてん : 1）isosbestic point
等号 / とうごう : n 1）equal sign
等原子価 / とうげんしか : 1）isovalent
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等差数列

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