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两个有理分式求导公式

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青青子衿 posted 2020-10-28 16:50 |Read mode
\begin{align*}
\dfrac{{\mathrm{d}}}{{\mathrm{d}}x}\left(\dfrac{Ax+B}{Cx+D}\right)&=\dfrac{\begin{vmatrix}
A&B\\
C&D\\
\end{vmatrix}}{\big(Cx+D\big)^2}\\
\dfrac{{\mathrm{d}}}{{\mathrm{d}}x}\left(\dfrac{Ax^2+Bx+C}{Dx^2+Ex+F}\right)&=\dfrac{\begin{vmatrix}
1&-2x&x^2\\
A&B&C\\
D&E&F\\
\end{vmatrix}}{\big(Dx^2+Ex+F\big)^2}\\
\end{align*}

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isee posted 2020-10-28 19:05
Last edited by isee 2020-10-29 19:09回复 1# 青青子衿


第二个在高中,特别是在解析几何中,很实用....不过,在使用的过程发现,第二个,要求分子分母不可约( 即无公因式),否则可能会出现其名问题...

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