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F‘(x)=(xf’(x)-f(x))/x^2(求導),由於x^2>0(x不為0),所以可以將分子拿出來研究,設g(x)=xf’(x)-f(x),g‘(x)=xf‘’(x)+f’(x)-f‘(x)=xf’‘(x),g‘(0)=0(如果有定義)所以:當x>0時,g…
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