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如何由等差中项和等比中项求前n项和呢？抓住关键性质解题突破口
本部分的内容是为打卡易错题1000题的视频版；本节讲述了由等差中项和等比中项求前n项和，希望对大家有帮助。@头条教育
高三数学一轮复习错题没人讲解，可看这里，解决你没搞明白的问题476/893
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