lim√2n(√(n+3a)-√n)=1求a

lim√2n(√(n+3a)-√n)=1求a lim√[(3n^2)+1]/(7n+1)=? 若lim(2n-√4n^2+an+3)=1,n→∞,求a. lim n→∞ n/√(2n+1)(n+1)= 极限lim(n→∞)√(n^2-3n)/2n+1 等于多少 lim √(n^2-3n)/2n+1 n→0 用夹逼定理求lim(n→∞)[√(n^2+n)-n]^(1/n) 用夹逼定理求lim(n→∞)√[(n^2+n)-n]^(1/n) lim x→n (√n+1-√n)*√(n+1/2)lim x n→∞ (√n+1-√n)*√(n+1/2) 求极限lim n趋向于无穷（1/n）*√(n+1)(n+2)⋯(n+n) lim(n→∞)(sin(n+√(n^2+n)))^2lim(n→∞)(1/n!(1!+2!+…+n!)) lim [√(3n+1)-√(3n)] /[√(5n+1)-√(5n)] 用数学极限的定义证明lim(n-∞)√(n^2+4)/n=1 lim√n+2-√n+1/√n+1-√n,x趋近于无穷大 lim(n->无限)(√ n)sinn/(n+1) 求极限lim(√(n^2-1) -n)/(n-√(n^2+1))的值 lim根号n^2+n+1/3n-2=? lim(3^2n+5^n)/(1+9^n)=?