(\partial)/(\partial y)(8y-(x+y)^3)

解答

\frac{\partial}{\partial y} (8 y - (x + y)^{3})

- 3 y^{2} - 6 y x + 8 - 3 x^{2}

求解步骤

\frac{\partial}{\partial y} (8 y - (x + y)^{3})

化简

8 y - (x + y)^{3} : 8 y - x^{3} - 3 y x^{2} - 3 y^{2} x - y^{3}

= \frac{\partial}{\partial y} (8 y - x^{3} - 3 y x^{2} - 3 y^{2} x - y^{3})

将

x

视为常数

使用微分加减法定则:

(f \pm g)^{'} = f^{'} \pm g^{'}

= \frac{\partial}{\partial y} (8 y) - \frac{\partial}{\partial y} (x^{3}) - \frac{\partial}{\partial y} (3 y x^{2}) - \frac{\partial}{\partial y} (3 y^{2} x) - \frac{\partial}{\partial y} (y^{3})

\frac{\partial}{\partial y} (8 y) = 8

\frac{\partial}{\partial y} (x^{3}) = 0

\frac{\partial}{\partial y} (3 y x^{2}) = 3 x^{2}

\frac{\partial}{\partial y} (3 y^{2} x) = 6 x y

\frac{\partial}{\partial y} (y^{3}) = 3 y^{2}

= 8 - 0 - 3 x^{2} - 6 x y - 3 y^{2}

化简

= - 3 y^{2} - 6 y x + 8 - 3 x^{2}

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