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Bai Tap Chuoi Luy Thua Co Loi Giai Tinh Tong
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Bài tập
1. Tìm bán kính hội tụ của các chuỗi sau:
23 22
2 1)
nnnn
na x n n
10
- 22 !!
nn
nb x n
11
- 1 1
nnn
c x n
21
)3 .
nnn
x d n
212
) 18 3ln
nnn
ne x n
2
2 3 12
1)2
n nnn
nf x n
Hướng dẫn
23 22
2 1)
nnnn
na x n n
2/3 1/2
1lim lim| |12 12
nnn nnnn
n nR a
21/3 1 2//
1lim212 12
nnn n
n n
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