[工數] 為什麼重根時要多乘一個t
(4) 2 " 4
y - 2k y + k y = 0 where k is constant
at
Let y = e
4 2 2 4
=> a - 2k a + k = 0, a = ±k (k,k,-k,-k)
kt kt -kt -kt
y = Ae + Bte + Ce + Dte
請問為什麼在重根時需要再乘上一個t?
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※ 編輯: eolith123 (140.113.130.108), 04/22/2014 13:58:41
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