谢谢指教。他好几年没搞数学比赛了。初中搞过Mathcounts, 他们team拿了很多奖包括州里。现在再拾起来，有点晚了。

来源: 9112020 于 2020-10-24 17:44:42 [旧帖] [给我悄悄话] 本文已被阅读：次

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