已知f(x)为可导函数且 '(1)=-2, 则 lim _(harrow 0)dfrac (f(1-h)-f(1-2h))(2h)=

若极限lim _(harrow 0)dfrac (f({x)_(0)+2h)-f((x)_(0))}(h)=dfrac (1)(2)，则导数值lim _(har

(1)若f(x)在 =(x)_(0) 处可导,则 () .-|||-(A) lim _(harrow 0)dfrac (f({x)_(0)+2h)-f((x)_

(2)已知f(x)在 =(x)_(0) 处可导,且有 lim _(harrow 0)dfrac (2h)(f({x)_(0))-f((x)_(0)-4h)}=-

(f(x)在 _{0)=(x)_(0) 处可导,且 lim _(harrow 0)dfrac (f({x)_(0)+2h)-f((x)_(0)-h)}(2h)=

设函数f(x)满足lim _(harrow 0)dfrac (1)(h)[ f(5-dfrac (1)(3)h)-f(5)] =2,则lim _(harrow

[题目]设函数f (x)在 x=0 处连续,且 lim _(harrow 0)dfrac (f({h)^2)}({h)^2}=1,-|||-则 ()-|||-

29 设f(x)是以3为周期的可导函数且是偶函数, f(-2)=-1 ,则-|||-.lim _(harrow 0)dfrac (h)(f(5-2sin h)-

=(e)^2x-1 的反函数为 __-|||-2.若 (0)=0. (0)=2, 则 lim _(harrow 0)dfrac (f(2h))(h)= __

[题目]已知 (3)=2, 则 lim _(harrow 0)dfrac (f(3-h)-f(3))(2h)= __

6、单选-|||-f-|||-A .lim _(harrow 0)dfrac (f({x)_(0)+5h)-f((x)_(0)+2h)}(h)=f((x)_(0