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奇偶不確定 如f(x)=x^3 g(x)=-x^3都是奇函數定義域為R 都是奇函數但f(x)+g(x)=0是偶函數 f(x)=x g(x)=-x^3都是奇函數定義域為R f(x)+g(x)=x-x^3還是奇函數
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