等比级数

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((děng )()()(shù )(děng )()()(shù ))

(shù )(xué )(yòng )()()(chēng )()()()(shù )(cóng )()(èr )(xiàng )(shǐ )()(xià )(rèn )()(xiàng )()(qián )()(xiàng )(de )()(héng )(děng )(de )()(shù )()1+2+4+8+……。

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●等比级数(简体版)

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