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$$$x - 20$$$的导数
您的输入
求$$$\frac{d}{dx} \left(x - 20\right)$$$。
解答
和/差的导数等于导数的和/差：
$${\color{red}\left(\frac{d}{dx} \left(x - 20\right)\right)} = {\color{red}\left(\frac{d}{dx} \left(x\right) - \frac{d}{dx} \left(20\right)\right)}$$常数的导数是$$$0$$$:
$$- {\color{red}\left(\frac{d}{dx} \left(20\right)\right)} + \frac{d}{dx} \left(x\right) = - {\color{red}\left(0\right)} + \frac{d}{dx} \left(x\right)$$应用幂法则 $$$\frac{d}{dx} \left(x^{n}\right) = n x^{n - 1}$$$，取 $$$n = 1$$$，也就是说，$$$\frac{d}{dx} \left(x\right) = 1$$$：
$${\color{red}\left(\frac{d}{dx} \left(x\right)\right)} = {\color{red}\left(1\right)}$$因此，$$$\frac{d}{dx} \left(x - 20\right) = 1$$$。
答案
$$$\frac{d}{dx} \left(x - 20\right) = 1$$$A
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