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无需求公比q，由等比数列性质简化计算，巧解4项的倒数和，不难喽
本部分的内容是为打卡易错题1000题的视频版；本节讲述了不求q，直接求和，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402/893
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