A Level pure calculus differentiation rule 求导法则 词汇拆解与释义 Differentiation rule 是求 derivative 时使用的规则。 P1 常见规则 Power rule: ddxxn=nxn−1\frac{d}{dx}x^n=nx^{n-1}dxdxn=nxn−1。 Constant multiple rule: ddx[kf(x)]=kf′(x)\frac{d}{dx}[kf(x)]=k f'(x)dxd[kf(x)]=kf′(x)。 Sum rule: ddx[f(x)+g(x)]=f′(x)+g′(x)\frac{d}{dx}[f(x)+g(x)]=f'(x)+g'(x)dxd[f(x)+g(x)]=f′(x)+g′(x)。 P1 用法 题目通常要求 differentiate 或 find the derivative。