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要保證F(x)=log2(x+8-b/x)在[1,+∞)上是增函數,結合到函數G(x)=log2 x在(0,+∞)上是增函數,故只需保證f(x)=x+8-b/x在[1,+∞)上是增函數即可先對f(x)=x+8-b/x求導f(x)=x+8-b/x,f'(x)=1+b/x^=(x^+b)/x^要使f(x)=x+8-b/…
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