Question

Jas

1.要怎麼求他的收斂半徑
2.x項的Cn 和 Cn+1是誰放在分母
求解🙏

00
56. Σmmxm
M
m=1

C
lim
1+15+1
1300
c,x"
, equivalently, when
|x|< lim
3001
n-o
Cn
= |x| lim
= R
n+1
11-00
Cn
<1
收斂