切线
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导的意思解释？因势利导的意思解释！
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导数与物理，几何，代数关系密切：在几何中可求切线；在代数中可求瞬时变化率；在物理中可求速度、加速度。 导数亦名纪数、微商（微分中的概念），是由速度变化问题和曲线的切线问题（矢量速度…
