证明n趋向无穷时,5n^2/(7n-n^2)的极限等于-5

证明n趋向无穷时,5n^2/(7n-n^2)的极限等于-5 证明当n趋向于无穷时数列an=(1*3*5*7*...*2n-1)/(2*4*6*8*...*2n)趋向于0? lim(2^n+3^n)^1 (n趋向无穷) (2^n*n!)/n^n在n趋向无穷时等于多少? n趋向于无穷 证明数列sin n(n为正整数）当n趋向正无穷时极限不存在 用极限定义证明： lim( 2^n/n!)=0 其中n趋向于无穷. 依据极限定义证明lim{（n^2+a^2）/n}=1 n趋向于无穷时 当n趋向于无穷时,求n^(1/2)*[n^(1/n)-1]的极限 当n趋向无穷时,1/(n^2+1)+2/(n^2+2)+.+n/(n^2+n)的极限是多少 在n趋向无穷时（n+1分之一+n+2分之2+.+n+n分之n）的极限 求n趋向无穷时 [(1+1/n)(1+2/n)...(1+n/n)]^1/n 的极限? 计算数列极限,当N趋向于无穷时,根号下(N^2+4N+5)-(N-1)的极限 (2n^3+n^2-6n+7)/(3n^3+4n^2-1),n趋向于无穷时的极限值是多少 为什么lim n趋向无穷 (5n^2-4n)/(3n^2+2n-1)等于5/3 lim[(-2)^n+3^n]/[(-2)^(n+1)+3^(n+1)] 当n趋向于无穷时 求极限 n趋向无穷 2^n+1 + 3^n+1/2^n+3^n lim(n/(n^2+1)+...+n/(n^2+n))x趋向于无穷 求解答过程~