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x0表示指定的定義域x的值 Δx表示任意一微小的增量 x0+Δx表示x0的鄰域 比喻說題中: 設函數y = f(x)在某區間內有定義,x0及x0 +Δx在此區間內. 有函數f(x)在點x0及其鄰域(x0+Δx)有定義.
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