file:38 进阶训练—和倍问题四.mp4 file:36 仓库管理员“探探”—和倍问题二.mp4 file:34 最终的阅兵式—等差数列之数阵问题.mp4 file:33 阅兵前的选拔—偶数项和奇数项等差数列的求和技巧.mp4 file:32 小组内部的编号难题—末项和项数公式.mp4 file:31 找毛球比赛的奖励—盈亏问题三.mp4 file:30 古老而神秘的数字军团.mp4 file:28 美砂的开学第一天—盈亏问题一.mp4
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