用极限的定义证明lim _(narrow infty )dfrac (sqrt {{n)^2+(a)^2}}(n)=1

2.按 -N 定义证明:-|||-(1) lim _(narrow infty )dfrac (n)(n+1)=1 ;-|||-(2) lim _(narrow

1.利用数列极限的" -N 定义证明:-|||-(1) lim _(narrow infty )dfrac (1)({n)^2}=0;-|||-(2) lim

根据数列极限定义证明：(1) lim _(narrow infty )dfrac (1)({n)^2}=0-|||-(2) lim _(narrow infty

用数列极限的定义证明：lim _(narrow infty )dfrac (3n+1)(2n+1)=dfrac (3)(2)-|||-__用数列极限的定义证明：

根据数列极限的定义证明:-|||-lim dfrac (sqrt {{n)^2+(a)^2}}(n)=1

根据数列极限的定义证明：lim _(narrow infty )dfrac (2n+1)(3n+1)=dfrac (2)(3)根据数列极限的定义证明：

根据数列极限的定义证明:lim _(narrow infty )dfrac (3n+1)(2n+1)=dfrac (3)(2) __根据数列极限的定义证明:

根据数列极限的定义证明：lim _(narrow infty )dfrac (3n+1)(2n+1)=dfrac (3)(2);根据数列极限的定义证明：

求极限__-|||-lim _(narrow infty )dfrac (n)(ln n)(sqrt [n](n)-1).求极限.

lim _(narrow infty )(dfrac (1)({n)^2+(e)^-1+1}+dfrac (2)({n)^2+(e)^-2+2}+dfrac (