3.已知lim_(xtoinfty)(sqrt[3](1-x^3)-ax-b)=0，求a和b.

5 设a,b为常数，且lim_(xtoinfty)(sqrt[3](1-x^6)-ax^2-b)=0，则a=____ b=____5 设a,b为常数，且$\li

3.设lim_(xtoinfty)((x+1)^3-(x-1)^3)/(2x^2)+3x+4=b(bneq0且bneqinfty),则a=____,b=____

1.求极限lim_(xtoinfty)(1-(3)/(x))^5x1.求极限$\lim_{x\to\infty}\left(1-\frac{3}{x}\righ

3.求极限 lim _(xarrow 1)dfrac (sqrt [3]{x)-1}(sqrt {x)-1}

lim_(x to 0) (1 - ax)^(2)/(x) = e^3，则a=A. $-3$B. $-\frac{3}{2}$C. $-2$D. $\frac{

3.求极限lim_((x,y)to(0,0))(sin(xy))/(sqrt(4-xy)-2)=(0)/(0).3.求极限$\lim_{(x,y)\to(0,0

求极限lim _(xarrow 0)dfrac (x)(sqrt {1-x)-1}= ()lim _(xarrow 0)dfrac (x)(sqrt {1-x)

②lim_(xto+infty)(1+x)^(1)/(x).③lim_(xtoinfty)(1+(1)/(sqrt(1+x^2)))^x. ④lim_(xto

（3）已知lim _(xarrow 2)dfrac ({x)^2+ax+b}({x)^2-x-2}=2-|||-__，求a，b.（3）已知，求a，b.

[题目]若 lim _(xarrow infty )(dfrac ({x)^2+1}(x+1)-ax-b)=0, 求a,b的值.