孩子還沒喜歡上數學，也許僅僅是因為還沒機會見到類似這樣的東西：拋物線的開口怎麼就合攏了？
金拇指 (2020-04-27 08:23:23) 评论 (0)
海外博客
孩子還沒喜歡上數學，也許僅僅是因為還沒機會見到類似這樣的東西：拋物線的開口怎麼就合攏了？
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