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1.若f(x)在(a,b)內有界,則存在M,恒有|f(x)|≤M,即-M≤f(x)≤M,所以f(x)在有上界M,下界-M 2.若f(x)在有上界M,下界N,則恒有N≤f(x)≤M,設T=Max{ |M|,|N| },則恒有-T≤N≤f(x)≤M≤T, 即|f(x)|
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