(1) lim(xâ1)(x^2-2x+1)/(x^2-1)=lim(xâ1)(x-1)^2/[(x-1)(x+1)]=lim(xâ1)(x-1)/(x+1)=0
(2) lim(xâ4)(x^2-6x+8)/(x^2-5x+4)=lim(xâ4)(x-2)(x-4)/[(x-1)(x-4)]lim(xâ4)(x-2)/(x-1)=2/3
(3) åå¼=lim(xâ2)(x+2)/[(x-2)(x+2)]=â
(4) åå¼=lim(nââ)1/2[1-1/3+1/3-1/5+â¦â¦+1/(2n-1)-1/(2n+1)]=lim(nââ)1/2[1-1/(2n+1)]=1/2
(5) åå¼=lim(xâ0)x^2[1+â(1+x^2)]/(-x^2)=lim(xâ0)[1+â(1+x^2)]=2
(6) åå¼=lim(nââ)3/[â(x^2+1)+â(x^2-2)]=0
(7) âµlim(xâ0)x^2=0 |sin(1/x)|<=1 â´lim(xâ0)x^2|sin(1/x)=0
(8) âµlim(xââ)1/x=0 |arctan x|<Ï/2 â´lim(xââ)arctan x/x=0
温馨提示:答案为网友推荐,仅供参考