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粒子的位置: s(t) = 4t^3 - t^4 (米, t 秒)。计算 v(1) 、 和 ,并解释 。
粒子的位置: s(t) = 4t^3 - t^4 (米, t 秒)。计算 v(1) 、 和 ,并解释 。
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