將多項式的商展開為部份分式

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parfrac 不會展開包含具有小數點之常數的任何運算式。

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PTC Mathcad 預設會在有理數範圍內執行部份分式分解。亦即，如果初始運算式是含有理係數之多項式的商，則結果中的多項式也會有有理係數。

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