derivative of x/(x+13)

解

\frac{d}{d x} (\frac{x}{x + 13})

\frac{13}{( x + 13 ) ^{2}}

解答ステップ

\frac{d}{d x} (\frac{x}{x + 13})

商の法則を適用:

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

= \frac{\frac{d x}{d x} ( x + 13 ) - \frac{d}{d x} ( x + 13 ) x}{( x + 13 ) ^{2}}

\frac{d x}{d x} = 1

\frac{d}{d x} (x + 13) = 1

= \frac{1 \cdot ( x + 13 ) - 1 \cdot x}{( x + 13 ) ^{2}}

1 \cdot (x + 13) - 1 \cdot x = 13

= \frac{13}{( x + 13 ) ^{2}}