等差级数

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((děng )(chà )()(shù )(děng )(chà )()(shù ))

(shù )(xué )(yòng )()(cóng )()(èr )(xiàng )(shǐ )()(xià )(rèn )()(xiàng )()(qián )()(xiàng )(de )(chà )(héng )(děng )(de )()(shù )()10+14+18+22+26+……。()()()(yòng )a+(a+d)+(a+2d)+(a+3d)+……(de )(xíng )(shì )(lái )(biǎo )(shì )()(chēng )(suàn )(shù )()(shù )

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●等差级数(简体版)

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