derivative of ln(8x-5*7^{5x-2})

解答

\frac{d}{d x} (ln (8 x - 5) \cdot 7^{5 x - 2})

\frac{8 \cdot 7 ^{5 x - 2}}{8 x - 5} + 5 ln (7) \cdot 7^{5 x - 2} ln (8 x - 5)

求解步骤

\frac{d}{d x} (ln (8 x - 5) \cdot 7^{5 x - 2})

使用微分乘法定则:

(f \cdot g)^{'} = f^{'} \cdot g + f \cdot g^{'}

f = ln (8 x - 5), g = 7^{5 x - 2}

= \frac{d}{d x} (ln (8 x - 5)) 7^{5 x - 2} + \frac{d}{d x} (7^{5 x - 2}) ln (8 x - 5)

\frac{d}{d x} (ln (8 x - 5)) = \frac{8}{8 x - 5}

\frac{d}{d x} (7^{5 x - 2}) = 5 ln (7) \cdot 7^{5 x - 2}

= \frac{8}{8 x - 5} \cdot 7^{5 x - 2} + 5 ln (7) \cdot 7^{5 x - 2} ln (8 x - 5)

分式相乘:

a \cdot \frac{b}{c} = \frac{a \cdot b}{c}

= \frac{8 \cdot 7 ^{5 x - 2}}{8 x - 5} + 5 ln (7) \cdot 7^{5 x - 2} ln (8 x - 5)

\frac{d}{d x} (5 x^{2} cos (x) - 4 x)

a re a y = \frac{4}{1 + x ^{2}}, y = 1

\frac{d}{d t} (t^{2} - 2 t)

x^{^{'}} = 0.1078 \cdot (1 - \frac{x}{105900}) x - 0.1 \cdot x

s l o p e (2.6) (5.15)