他上过AoPS的课或是学过他家的教材或者参加过数学竞赛吗？如果没有，那还是跟着可汗学好了．

来源: Pilsung 于 2025-07-01 10:16:20 [旧帖] [给我悄悄话] 本文已被阅读：次

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