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作者 erlangsen 在 PTT [ Math ] 看板的留言(推文), 共6則
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4F推:成本比賣價高,怎可能賺錢?XDDDD10/05 15:00
2F→:為什麼要拉進x^3呢?02/07 02:31
5F→:所以如果是y''-2y+y=2xcosx,則特解要假設成Cx+D乘上02/07 02:47
8F→:(x+1)(cosx+sinx) 這樣對嗎?02/07 02:48
11F→:okok...我了解了,因為乘上x還是重複,所以需要再乘02/07 02:56
12F→:謝謝樓上諸位02/07 02:59
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