等差数列组成的数列的求和，经典复杂数列难题，瑞典奥数1983年决赛题目
Synopsis
复杂数列求和是现在考大学经常的考题。本视频可以为考大学\提供方法基础工具。本视频从每个子数列的首项入手，先求出子数列首 ...
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