lim(n→∞)[a^(n+1)*(n+1)^(n+1)/(n+1)^(n+1)]/[a^n* n!/ n^n] (a>0)
=lim(n→∞)[a(n+1)n^n]/(n+1)^(n+1)
=lim(n→∞)a[n/(n+1)]^n
=lim(n→∞)a/(1+1/n)^n
=a/e
若0e,则该级数发散
综上,当0
lim(n→∞)[a^(n+1)*(n+1)^(n+1)/(n+1)^(n+1)]/[a^n* n!/ n^n] (a>0)
=lim(n→∞)[a(n+1)n^n]/(n+1)^(n+1)
=lim(n→∞)a[n/(n+1)]^n
=lim(n→∞)a/(1+1/n)^n
=a/e
若0e,则该级数发散
综上,当0