16.若 (x)=ln (1+(x)^2), 则 lim _(harrow 0)dfrac (f(3)-f(3-h))(h)= __

9.设函数 (x)=ln (1+(x)^2), 则 lim _(xarrow 0)dfrac (f(3+2h)-f(3-h))(h)= __ .

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

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

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

[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 ()-|||-

(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)}=-

已知 (0)=3, 则 lim _(harrow 0)dfrac (f(-h)-f(0))(3h)=

设lim _(xarrow 0)dfrac (ln (1+x+dfrac {f(x))(x))}(x)=3，则lim _(xarrow 0)dfrac (ln

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