lim_(x to 0) (2^x-1)/(x)= ( )

lim_(x→1)（(2)/(({x^2)-1)}-(1)/(x-1)）=（ ）A. -1B. $-\frac{1}{2}$C. $\frac{1}{2}$D.

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

lim_(x arrow 1) (sin^2(x-1))/(x^2)-1$\lim_{x \rightarrow 1} \frac{\sin^{2}(x-1)}

求极限 lim_(x to infty) ( (2x+3)/(2x+1) )^x-1 求极限 $\lim_{x \to \infty} \left( \frac

lim_(x to 0) ( (1)/(x^2) - (1)/(x arcsin x) ) $\lim_{x \to 0} \left( \frac{1}{x^

(1992)lim_(xto0)(e^x-sin x-1)/(1-sqrt(1-x^2))(1992)$\lim_{x\to0}\frac{e^{x}-\sin

若 lim_(x to 0) (f(2x))/(x) = 2，则 lim_(x to infty) xf((1)/(2x)) = ( )A. $\frac{1}

极限lim_(xto0)(e^x-sin x-1)/(1-cos x)=( ).A. 0B. 1C. 2D. 不存在

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

3.计算下列极限(1) lim_(x→2)(-2) ;(2) lim_(x→1)(x^3-x^2+x-1) ;21(3)lim_(x→2)(x^2-16)/(x