derivative (3+xf(x))/(sqrt(x))

解答

导数

\frac{3 + x f ( x )}{x}

\frac{3 x ^{2} f - 3}{2 x x}

求解步骤

\frac{d}{d x} (\frac{3 + x f x}{x})

将

f

视为常数

使用微分除法定则:

(\frac{f}{g})^{'} = \frac{f ^{'} \cdot g - g ^{'} \cdot f}{g ^{2}}

= \frac{\frac{d}{d x} ( 3 + x f x ) x - \frac{d}{d x} ( x ) ( 3 + x f x )}{( x ) ^{2}}

\frac{d}{d x} (3 + x f x) = 2 f x

\frac{d}{d x} (x) = \frac{1}{2 x}

= \frac{2 f x x - \frac{1}{2 x} ( 3 + x f x )}{( x ) ^{2}}

化简

\frac{2 f x x - \frac{1}{2 x} ( 3 + x f x )}{( x ) ^{2}} : \frac{3 x ^{2} f - 3}{2 x x}

= \frac{3 x ^{2} f - 3}{2 x x}

\frac{d}{d x} (ln (1 - \frac{10}{x}))

d er i v a t i v e f (x) = 5 x + 1

d er i v a t i v e f (x) = \frac{( tan ( x ) - 1 )}{sec ( x )}

\int_{0}^{2} x^{2} d x

\frac{d}{d x} (\frac{2}{e ^{x} + e ^{- x}})