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熟練的話可以這樣計算: 由題目知:因為Z-1=-i Z²;-2Z=(Z-1)²;-1 那麼原式=Z-1-1/(Z-1)=-i+1/i=-2i 這樣計算是基於熟練基礎上的,算多了就會了.初學建議還是按部就班的照第二個回答來做吧.
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