噢，这个问题是如此简单，问题数据都作为声明中决策变量的系数直接包含在了目标函数和约束声明中。

Well, this problem is so simple that the problem data is directly included in the objective function and constraints declarations as the coefficients of the decision variables in the declarations.

youdao

现在可以看到，全微分里面的这些偏导数系数，都可以用一个变量表示出来。

Now you see how the total differential accounts for, somehow, all the partial derivatives that come as coefficients of the individual variables in these expressions.

youdao

这可以从 houseSize 变量前面负的系数看出来。

This can be seen by the negative coefficient in front of the houseSize variable.

youdao