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作者 t5d 在 PTT [ Grad-ProbAsk ] 看板的留言(推文), 共209則
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6F推:跟妳上次問的ln微分一樣阿@@ 內部項(a/s)要再對s微分一次02/07 20:34
8F推:不是乘-a 你把a/s對s微分一次看看阿02/07 20:57
1F推:把左邊分母的t乘過去右邊就是答案了阿02/07 20:27
3F推:....乘到右邊去不就有t了02/07 20:54
1F→:斜直線算是很簡單的送分題了..考雙曲線時才困難= ="02/06 15:19
3F推:感謝02/06 10:55
2F推:..我不會Q_Q 要怎麼積阿02/06 10:05
4F推:大師指點一下 要怎麼令02/06 10:34
2F→:嗯..因為他只問特解就沒注意了 感謝樓上02/05 17:43
3F→:請問要怎麼做呢@@? 令yp=Acos2x + Bsin2x就好了不是嗎?02/05 17:41
5F→:喔對= =" 我耍笨了Orz 感謝XD02/05 17:44
1F推:我慢了36秒XD02/05 17:33
11F推:那應該是證明題吧 證出週期函數的拉氏為02/05 17:15
13F→:L{f(t)} = [1/1-e^(-sT)]∫f(t)e^(-st)dt 積分範圍0~T02/05 17:16
14F→:翻一下書應該就有證明過程02/05 17:17
4F推:好誇張的積分...XD 看到都頭痛了02/05 15:04