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[题目]设有数列(xn)与(yn),以下结论正确的是 ()-|||-A.若 lim _(narrow infty )(x)_(n)(y)_(n)=0, 则必有
→(a)→∞-|||-lim _(narrow infty )(x)_(n)=+infty lim _(narrow infty )(y)_(n)=infty
1.利用数列极限的" -N 定义证明:-|||-(1) lim _(narrow infty )dfrac (1)({n)^2}=0;-|||-(2) lim
已知 lim _(narrow infty )(a)_(n)=2 lim _(narrow infty )(b)_(n)=3已知 lim _(narrow in
根据数列极限定义证明：(1) lim _(narrow infty )dfrac (1)({n)^2}=0-|||-(2) lim _(narrow infty
6.数列极限 lim _(narrow infty )n[ ln (n-1)-ln n] =
__-|||-lim _(narrow infty )([ sin (dfrac {pi )(4)+dfrac (1)(n))] }^n=( )A.
lim _(narrow infty )(sqrt ({n)^2+n}-n)=____________
2.按 -N 定义证明:-|||-(1) lim _(narrow infty )dfrac (n)(n+1)=1 ;-|||-(2) lim _(narrow
极限lim _(narrow +infty )((dfrac {1)(3))}^n= A 0 B 1极限A0B1