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不是 若存在兩個A和B,對一切x∈Df恒有A≤f(x)≤B,則稱函數y=f(x)在Df內是有界函數,否則為無界函數. 證明A、B存在就行,不用非是相反數. 比如y=sinx+1有界,上界≥2,下限≤0就行
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