(1) If f(x)=x8\displaystyle {f{{\left({x}\right)}}}={x}^{{8}}, then f′(x)=\displaystyle {f}'{\left({x}\right)}=  

(2) If g(x)=−8x3\displaystyle {g{{\left({x}\right)}}}=-{8}{x}^{{3}}, then g′(x)=\displaystyle {g}'{\left({x}\right)}=  

(3) If h(x)=1x4\displaystyle {h}{\left({x}\right)}=\frac{{1}}{{x}^{{4}}}, then h′(x)=\displaystyle {h}'{\left({x}\right)}=  

License