(2)、原式=lim[1-(2/3)^n]/[3-2(2/3)^n]=(1-0)/(3-0)=1/3;
(4)、原式=lim[v(n^2+4n)-n]*[v(n^2+4n)+n]/[v(n^2+4n)+n],
=lim4n/[v(n^2+4n)+n]
=lim4/[v(1+4/n)+1]
=4/[v(1+0)+1]
=2;
(6)、原式=limn→∞(2+sin^2n)^(1/n)
=limt→0[2+sin^2(1/t)]^t
=C^0=1;
(8)、原式=lim[1+1/(n+1)]^(n+1)/[1+1/(n+1)]
=e/(1+0)=e;
(10)、原式=lim[1+1/(n-4)]^(n-4)*[1+1/(n-4)]^8
=e*(1+0)^8=e。
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