[微積] 級數歛散性
Find the values of x for which the series converges.
Find the sum of the series for those value of x.
∞
a)Σ2^n‧x^n
n=0
∞
b)Σ(cosx)^n/4^n
n=0
如果我解讀題目沒錯了話
a小題應該是用Root Test吧
然後可以求出 x < 1/2
啊這樣子要怎麼算數列和啊
是我用的方法有錯
還是理解錯題目
b小題有一樣的疑問
--
--
※ 發信站: 批踢踢實業坊(ptt.cc)
◆ From: 140.115.218.79
→
03/09 20:32, , 1F
03/09 20:32, 1F
→
03/09 20:34, , 2F
03/09 20:34, 2F
→
03/09 20:35, , 3F
03/09 20:35, 3F
→
03/09 20:35, , 4F
03/09 20:35, 4F
推
03/09 20:35, , 5F
03/09 20:35, 5F
→
03/09 20:36, , 6F
03/09 20:36, 6F
→
03/09 20:41, , 7F
03/09 20:41, 7F
→
03/09 20:41, , 8F
03/09 20:41, 8F
→
03/09 20:44, , 9F
03/09 20:44, 9F
→
03/09 20:45, , 10F
03/09 20:45, 10F