第三題那麼簡單的題目，他居然套公式，一看就是沒有理解。我和他解釋，甲和乙原本有80千米，每小時他們之間的差距縮小20千米，過4個小時差距為零，就是甲追上了乙。說到最後實在是火大，使勁把筆扔了出去。我也不明白，他在勤思班看著挺好的，怎麼教起來那麼吃力
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奧數題4
6 years ago in #cn by cicadaluo (37)
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