( 单选题 ) 很显然^xapprox x+1(xarrow 0)A 错 B 对

很显然(1-x)approx -x(xarrow 0).（）很显然.（）A.错B.对

很显然^x-1sim xA 对 B 错很显然A对B错

19.[单选题]-|||-函数 =(x)^3 的拐点为 x=0-|||-A 对-|||-B 错

lim _(xarrow 0)dfrac (sqrt {x+1)-1}(x)= () ． ．

(4) lim _(xarrow 0)dfrac (sqrt {x+1)-1}(x);

8.计算下列极限：(1) lim _(xarrow 0)dfrac (sin 4x)(sqrt {x+1)-1}(1) lim _(xarrow 0)dfrac

lim _(xarrow 0)[ dfrac (1)(2x)-dfrac (1)(x({e)^x+1)}] ;

5.单选题极限lim _(xarrow dfrac {pi )(2)}((1+cot x))^tan x=( )A.1B.eC.lim _(xarrow dfr

求极限：（1）lim _(xarrow 0)dfrac ({e)^2x-2(e)^x+1}({x)^2cos x}；（2）lim _(xarrow 0)dfra

(2) lim _(xarrow infty )((dfrac {x+1)(x-1))}^-dfrac (x{2)}= () ;-|||-(A)1 (B) ^d