s(t) = t^2 的瞬时速度 v(t) = limit as Delta t -> 0 of (s(t + Delta t) - s(t))/Delta t 。s(t) = t^2 的瞬时速度 v(t) = limit as Delta t -> 0 of (s(t + Delta t) - s(t))/Delta t 。

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