Khan 概念講得很清楚。孩子自己不一定有耐心看。你陪著看，看懂了多刷題。看不懂就是這個概念之前的概念也沒懂。

來源: 珍惜擁有於 2025-05-01 12:44:48 [博客] [舊帖] [給我悄悄話] 本文已被閱讀：次

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