若 lim_(x to 0) (f(2x))/(x) = 2，则 lim_(x to infty) xf((1)/(2x)) = ( )

8.设lim_(x to 0) (sin 2x + xf(x))/(x^3) = 1,则lim_(x to 0) (2cos x + f(x))/(x^2) =

设lim_(x to 0) (sin 2x + xf(x))/(x^3) = 1，则lim_(x to 0) (2cos x + f(x))/(x^2) = (

lim_(x arrow infty ) ((1+x)/(x))^2x$\lim_{x \rightarrow \infty } (\frac{1+x}{x})

lim_(x arrow infty ) (2x^3-x+1)$ \lim_{x \rightarrow \infty } (2x^3-x+1) $

lim_(xto2)(2x^2-4x+1)=（ ）A. 不存在.B. 等于0.C. 等于1.D. 等于-1

已知 lim_(x to infty)f(x)=A ，则必有 lim_(x to infty)f(x)=A 。( )A 对B 错40. (1.0分) 已知 $

1、如果lim_(xto x_0)f(x)=infty，lim_(xto x_0)g(x)=infty，则必有A. $\lim_{x\to x_0}[f(x)+

11.已知lim_(x to 0) (ln(1+frac(f(x))/(x)))(2^x-1)=3，则lim_(x to 0) (f(x))/(sqrt(1+x

已知lim _(xarrow +infty )(x)^a[ sqrt ({x)^2+1}+sqrt ({x)^2-1}-2x] =bneq 0 x]=b≠0，则

lim _(xarrow infty )((1-dfrac {1)(2x))}^x+2= ).A.lim _(xarrow infty )((1-dfrac {