单项式相乘，把它们的系数、相同字母分别相乘，对于只在一个单项式里含有的字母，则连同他的指数作为积的一个因式。
概率论的基本原理之一叫做乘法法则。
One of the first principles of probability theory is called the multiplication rule.
那么对于dA，我们必须谨慎地使用乘法法则，或用偏微分。
Well, then, dA, so we had to use the product rule carefully, or we use the partials.
可以通过隐函数微分法和乘法法则得到，或者直接,把关于x，y，z的偏微分放进来。
You can get this either by implicit differentiation and the product rule, or you could get this just by putting here, here,and here the partial derivatives of this with respect to x, y, and z.
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