1.利用数列极限的" -N 定义证明:-|||-(1) lim _(narrow infty )dfrac (1)({n)^2}=0;-|||-(2) lim _(narrow infty )dfrac (2n+1)(3n+1)=dfrac (2)(3)

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

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

1.利用 lim _(narrow infty )((1+dfrac {1)(n))}^n=e 求下列极限:-|||-(1) lim _(narrow inft

1.利用 lim _(narrow infty )((1+dfrac {1)(n))}^n=e 求下列极限:-|||-(1) lim _(narrow inft

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：

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 _(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：

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

(3)收敛, lim _(narrow infty )(2+dfrac (1)({n)^2})=2 --|||-(4)收敛, lim _(narrow inft