问题
解答题
求
|
答案
lim n→∞
=1+3+32+…+3n-1 3n+an+1 lim n→∞
=3n-1 2(3n+an+1) lim n→∞ 1 - 1 3n 2[1 +a(
)n]a 3
当0<a<3时,lim n→∞
=1+3+32+…+3n-1 3n+an+1 1 2
当a=3时,lim n→∞
=1+3+32+…+3n-1 3n+an+1 1 8
当a>3时,lim n→∞
=01+3+32+…+3n-1 3n+an+1