推 Aweather :a) alternating series test b) n-th root test 12/29 02:19
→ xx52002 :請問._./ 我學的alternating要正負相間才可以用@@ 12/29 02:21
→ xx52002 :可是a是正負負正正負負..這樣子可以套alternating te 12/29 02:22
→ xx52002 :test嗎@@? 12/29 02:22
推 chy1010 :你可以看 partial sum 確認 S_2n 跟 S_2n+1 極限相同 12/29 04:35
→ chy1010 :接著單看奇數項 partial sum 就是用 alternating 12/29 04:36
→ chy1010 :當然直接用 Dirichlet Test 也很省事就是了.... 12/29 04:36
→ Vulpix :(b) root test 12/29 04:56
→ Sfly :a) 1-(1/2+1/3) +(1/4+1/5)-(1/6+1/7)+...alt test 12/29 11:19
→ xx52002 :感謝各位! 12/30 00:56