derivative (2x^2-3x+1)/x

解答

导数

\frac{2 x ^{2} - 3 x + 1}{x}

\frac{2 x ^{2} - 1}{x ^{2}}

求解步骤

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

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

\frac{d}{d x} (2 x^{2} - 3 x + 1) = 4 x - 3

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

= \frac{( 4 x - 3 ) x - 1 \cdot ( 2 x ^{2} - 3 x + 1 )}{x ^{2}}

化简

\frac{( 4 x - 3 ) x - 1 \cdot ( 2 x ^{2} - 3 x + 1 )}{x ^{2}} : \frac{2 x ^{2} - 1}{x ^{2}}

= \frac{2 x ^{2} - 1}{x ^{2}}