[考題] 101調特-工程數學
[考題] 國考歷屆考題與考題觀念討論(書裡看到的選這個)請附上想法、出處
第一題的子題,題目如下:
v(t)''''+v(t)=0,求v(t)
I.C.:v(0)=1,v(0)'=v(0)''=v(0)'''=0
我用拉式轉換改寫成:V(s)=s^3 /(s^4 + 1)
然後就...回不去了...
我本來打算拆項,拆成分母為s^2 + i和s^2 - i,不過取反拉後會跑出根號i的情況。
根號i是沒有意義的...
是否一開始取拉式這條路就錯了呢!?謝謝。
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※ 編輯: tsamarfi 來自: 1.174.232.42 (08/19 13:23)
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