为什么圆的面积πr²的导数2πr正好是圆的�长,球的体积43πr³的导数4πr²正好是球的表面积? 知乎 Template


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tomski为什么圆的面积πr²的导数2πr正好是圆的�长,球的体积43πr³的导数4πr²正好是球的表面积? 知乎 coloring