我们首先要做的事是,求偏导数，fx是多少？

What we would start doing immediately is taking the partial derivatives. What is f sub x?

youdao

采用数值微商求偏导数的方法，从而使GPS网平差的计算模型非常简洁。

The numerical partial derivative is introduced to simplify the GPS network adjustment model.

youdao

计算偏导数的办法没这么麻烦，因为我们有常规的方法，因此我们不需要通过定义去求偏导数。

And, we'll actually learn how to compute their partial derivatives without having to do this because we'll just have the usual methods for computing derivatives.

youdao

Now let's take it in the other order.

我们用另一种顺序求二阶偏导数。

麻省理工公开课 - 热力学与动力学课程节选

And then we can take the derivative with respect to temperature, it's just R over molar volume minus b.

这样我们求,压强对温度的偏导数，结果等于R除以摩尔体积V杠减去b的差。

麻省理工公开课 - 热力学与动力学课程节选

So d/dT of dA/dV, just like this.

即对dA/dV求对温度T的偏导数。

麻省理工公开课 - 热力学与动力学课程节选