一直搞不懂微积分，看一集动画，马上就懂了，微分的概念和使用
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| MP4 | N/A | 480P | Download |
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微分是对函数的局部变化率的一种线性描述，通过微分可以描述当函数自变量的取值发生了足够小的改变时，函数的值是怎样改变的。
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