已知极限 lim _(x arrow infty)((x^2)/(x+1)-x-a)=2，则常数 a 是（ ）

(3)已知极限 lim _(xarrow +infty )(dfrac ({x)^2}(x+1)-x-a)=2, 则常数a是(

(7)已知极限 lim _(xarrow +infty )(dfrac ({x)^2}(x+1)-x-a)=2, 则常数a是 () 。(2017会计选择2 )-

1.6] 求极限= lim _(x arrow infty )( (1)/(x)+2^ (1)/(x))^x1.6] 求极限$= \lim _{x \right

计算下列极限lim _(arrow infty )dfrac (x)(sqrt {{x)^2+1}+x}计算下列极限

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

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

极限 lim _(xarrow infty )((dfrac {x+1)(x-1))}^x= __

已知 lim _(xarrow infty )((dfrac {x+2a)(x-a))}^x=8 ,求 a.

已知极限lim_(x to infty) (ax+3)/(x-1) = 2，则(）A. a=0B. a=2C. a=1D. a 为任意常数

极限lim _(x arrow 0) x sin (1)/(x^2)=（ ）A. 1；B. $\infty$；C. 不存在.D. 0；