2020-05-20
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导数与微分
导数由极限的含义严格定义:
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于是:
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其中,Δy代表了 微分
几何含义:
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导数: 代表了变化率 ;
切线: 有了导数后可被确定下来;
微分: dy, 代表向上变化的一点数值;
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