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設a,b是(-&,0)上的任意2個數,且a〉b 則f(a)-f(b)=(1-1/a)-(1-1/b)=1/b-1/a =(a-b)/ab 0>a>b,所以a-b>0,ab>0 f(a)-f(b)>0 f(a)〉f(b) 證畢
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