导数运算法则表: (1)$(cf(x))'=cf'(x)$(c为常数); (2)$[f(x) \pm g(x)]'=f'(x) \pm g'(x)$; (3)$[f(x) \cdot g(x)]'=f'(x) g(x)+f(x) g'(x)$; (4)$\left(\dfrac{1}{f(x)}\right)'=-\dfrac{f'(x)}{(f(x))^2}$; (5)$\left[\dfrac{f(x)}{g(x)}\right]'=\dfrac{f'(x) g(x)-f(x) g'(x)}{[g(x)]^2}(g(x) \neq 0)$.
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