(2)设函数 (x)=lim _(narrow infty )sqrt [n](1+{|x|)^3n} 则 f(x)在 (-infty ,+infty ) 内 ()-|||-(A)处处可导 (B)恰有一个不可导点-|||-(C)恰有两个不可导点 (D)至少有三个不可导点

(2)设函数 (x)=lim _(narrow infty )sqrt [n](1+{|x|)^3n}, 则 f(x)在 (-infty ,+infty ) 内

设函数(x)=lim _(narrow infty )dfrac ({x)^n+3}(sqrt {{3)^2n+(x)^2n}}(-infty lt xlt +

设 (x)=lim _(narrow infty )dfrac ({x)^n+2-(x)^-n}({x)^n+(x)^-n} 则函数(x)=lim _(narr

设(x)=lim _(narrow infty )dfrac ({x)^n+2}(sqrt {{2)^2n+(x)^2n}}，则(x)=lim _(narrow

→(a)→∞-|||-lim _(narrow infty )(x)_(n)=+infty lim _(narrow infty )(y)_(n)=infty

设(x)=lim _(narrow infty )dfrac ({x)^2n-1+a(x)^2+bx}({x)^2n+1}-|||-+bx/，若(x)=lim

6.设 (x)=lim _(narrow infty )dfrac ({x)^2n-1+a(x)^2+bx}({x)^2n+1} 在 (-infty ,+inf

7.设函数f(x)在 (-infty ,+infty ) 内可导,且 (x)=(e)^-2x+3lim _(xarrow 0)f(x) 则 (x)= ()()-

已知 lim _(narrow infty )(a)_(n)=2 lim _(narrow infty )(b)_(n)=3已知 lim _(narrow in

(x)=lim _(narrow infty )sqrt [n](1+{(2x))^n+(x)^2n}-|||-(xgeqslant 0) 的表达式;-|||-