設函數f(x)在x=a處可導,且lim[f(a+5h)]-f(a-5h)]/2h=1,則f'(a)=

設函數f(x)在x=a處可導,且lim[f(a+5h)]-f(a-5h)]/2h=1,則f'(a)=

那個極限式可以化為5/2(f'(a)+f'(a))=1,也即5f'(a)=1,f'(a)=1/5;