二阶偏导数例题

求函数f(x, y) = x^2 + y^3 的二阶偏导数回答：一阶偏导数：fx (x, y) = 2xfy (x, y) = 3y^2二阶偏导数：fxx (x, y) = 2fxy (x, y) = 0fyy (x, y) = 6y因此，f(x, y) = x^2 + y^3 的二阶偏导数为 fxx (x, y) = 2、fxy (x, y) = 0、fyy (x, y) = 6y...