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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1F→:聽說還可用Gamma Function但我還沒學218.166.64.187 03/30 22:24
1F→:其實可以用導數的定義直接做218.166.57.7 03/26 00:57
2F→:因為是趨近0 故答案為x的最低係數比218.166.57.7 03/26 00:57
3F→:也不會太慢 總之不要直接微...會死人..218.166.57.7 03/26 00:58
1F推:請直接背e^x=Σ(x^n)/n!會比較容易對照218.166.60.211 03/20 23:32
2F→:出代x=ln6就是題目要的218.166.60.211 03/20 23:32
5F→:不懂樓上在說什麼 取b_k={(-1)^(k-1)}/k218.166.65.236 03/18 00:13
6F→:則b_k收斂 (-1)^k*b_k 不收斂218.166.65.236 03/18 00:14
5F推:話說我發現Math 15978 我之前解過...218.166.48.202 03/14 13:19
6F→:難怪很眼熟218.166.48.202 03/14 13:20
1F→:分部積分 拆成x/(1+x^2)^2和arcsin(x)218.166.56.179 03/13 01:28
1F→:你怎確定最小值發生在x,y皆>0?要先證明218.166.60.234 02/24 21:15
2F→:而且f(-1,-1)=-1<3 極小值至少要<=-1218.166.60.234 02/24 21:22
4F→:的確沒最小值 而且算幾的使用條件要>0218.166.60.234 02/24 21:45
8F→:我剛說的有點問題 不過我的意思是218.166.60.234 02/24 22:07
9F→:要先確定極值發生在x,y>0才能用算幾吧218.166.60.234 02/24 22:08
10F→:不能直接用218.166.60.234 02/24 22:08
12F→:你的意思是他的解答就這樣?@@218.166.60.234 02/24 22:10
1F→:f(-1,-1)=-1<3 極小值至少要<=-1 不是3218.166.60.234 02/24 21:22
3F推:嗯 我說的是絕對極值 不是相對218.166.60.234 02/24 21:43
4F→:對喔 又錯同樣地方...更正218.166.58.224 02/20 19:58
1F→:第2題Σ"1/2"(1/(n+1)(n+2)-.....)140.112.66.65 02/18 07:57
2F推:我眼花..... 看錯140.112.66.65 02/18 07:59