求(n→∞)lim2^n-a^n/2^n+a^n(a≠-2)

求(n→∞)lim2^n-a^n/2^n+a^n(a≠-2) 若lim2^n/(2^n+1+a^n)=0 求a的取值范围 lim2^nsinx/2^n,n--无穷求详解 lim2^n +3^n/2^n+1+3^n+1 lim2^nsin(x/2^n),n→无穷大, 求lim2^n*sin(x/2^n)其中n趋向无穷大 求极限lim2^(n-1)sin(x/2^n) n趋近于无穷 lim2^n-3^n/2^n+1+3^n+1rtrtrtrt lim2^(n+1)+3^(n+1)/2^n+3^n x趋近无穷~ lim2^n/[2^(n+1)+a^n] =0,实数a的范围,为什么只要|a/2|>1就好了? 若lim2^n/[2^(n+1)+a^n]=1/2,则实数a的取值范围 求极限lim(n→∞)(a^n+(-b)^n)/(a^n+1+(-b)^n+1) 若a≠-2,求(n→∞)lim(2^n-a^n)/[2^n+a^(n+1)] 用夹逼定理证明lim2^n/n!=0 lim2^3n-3^(2n+1)/2^3n+3^2n趋近无穷大等于多少快 lim2^3n-3^(2n+1)/2^3n+3^2n趋近无穷大等于多少快 求极限lim n→∞(1/(n+1)+1/(n+2)+.+1/(n+n) 求极限(1/(n+1)+1/(n+2)+.+1/(n+n) 高数 极限运算法则lim(1+2+……+n)/n^2=lim1/n^2+lim2/n^2+……+limn/n^2=0n→∞ n→∞ n→∞ n→∞这为什么不对?