(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 )-|||-(A)1; (B)2; (C) -2; (D) -3。

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

已知极限 lim _(x arrow infty)((x^2)/(x+1)-x-a)=2，则常数 a 是（ ）A. 1B. 2C. -2D. -3

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

极限lim _(xarrow infty )(x)^2(2-xsin dfrac (1)(x)-cos dfrac (1)(x))=A.lim _(xarrow

(2) lim _(xarrow infty )((dfrac {2x+3)(2x+1))}^x+1;

(14) lim _(xarrow infty )((dfrac {x+2)(x+1))}^x;

)求下列极限:-|||-(1) lim _(xarrow 1)dfrac ({x)^2-x+1}({(x-1))^2} =-|||-(3) lim _(xarr

(1)极限 lim _(xarrow infty )([ dfrac {{x)^2}((x-a)(x+b))] }^x 等于 ()-|||-(A)1 (B) e

(3) lim _(xarrow infty )((dfrac {2x+3)(2x+1))}^x+1

(3) lim _(xarrow infty )((dfrac {2x+3)(2x+1))}^x+1;