求极限(1/2^n-1/2n),n趋于无穷

求极限：lim((2n∧2-3n+1)/n+1)×sin n趋于无穷 n趋于正无穷求极限n^2*ln[n*sin(1/n)] 求极限limn趋于无穷 1/n^2+2/n^2+...+n-1/n^2+n/n^2 求极限,lim(1+n)(1+n^2)(1+n^4)-----(1+n^2n)=?（n趋于无穷） 求极限(1/2^n-1/2n),n趋于无穷 求极限 Lim（n趋于无穷）(n^(2/3) sinn^2)/(n-1) 求极限k^2/(n^3+k^3) n趋于无穷,k=1到n Lim(1-3/2n)^4n+5.n趋于无穷,求极限 [(2n+3n)/( 2n+1+3n+1)]的极限,n趋于无穷 lim(n趋于无穷)[n(n+1)/2]/n方+3n的极限是多少? 高数求极限 2^n*n!(/n^n) n趋于无穷? 求极限 lim n趋于无穷 3n²+2n-1/2n²+n-10