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很簡單,直接根據定義列出運算式,然後稍微做一下變形即可.不妨設位移為2S,前一半位移耗時T1,後一半耗時T2,於是有S/T1=3;S/T2=2,全程的平均速度v=2S/(T1+T2);剩下的就是數學處理了:觀察已知和未知,即可發現可以如下…
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