作者查詢 / keith291
作者 keith291 在 PTT [ trans_math ] 看板的留言(推文), 共212則
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7F推: to 樓上,f(x)並不恆非負 無聊的例子 : x=2/(3π)01/05 16:50
1F→: 夾擠用錯12/15 12:53
2F→: 把定理重新看一遍 他只能用來證明"極限存在"12/15 12:55
3F→: 沒辦法用來證明不存在12/15 12:56
2F推:math板 精華區z-3-9-106/21 13:35
9F→:where is limit? 中間還先代入部分x,鐵定錯05/04 13:10
1F→:微一次就知道正不正確了04/23 12:40
1F→:lxl^2 = x^2 for x≠0 故 lxl/x=x/lxl for x≠004/23 12:39
1F→:(a)反了 x-->0+, mx=0,m=任意數 x-->0- sinx=004/22 23:18
2F→:然後因左極限=右極限,故極限存在,又極限值=函數值04/22 23:20
3F→:故連續04/22 23:20
4F→:(b)類似 用定義做 不能直接微04/22 23:23
1F→:原式對稱 又a=b時顯然成立 不失一般性設b < a11/21 00:12
2F→:(a+b)^(3/2) - a^(3/2) =b(3/2)c^(1/2) > b^(3/2)11/21 00:12
3F→:其中c是介於(b,a)中的數11/21 00:12
3F推:無窮級數非ln2 因級數1/n不絕對收斂140.112.66.200 06/13 00:24
4F→:重排會變值140.112.66.200 06/13 00:24
1F→:解這種問題不先證明極限存在是不恰當的.140.112.152.38 05/25 17:02
2F→:證明過程即會找到限制式確定答案140.112.152.38 05/25 17:03