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你利用圖像 y=(1/2)^x的圖像是過(0,1)的指數函數,減函數 y=lnx 的圖像是過(1,0)的對數函數,增函數 有一個交點, 所以 方程(1/2)^x=lnx的根的個數是1 或者 f(x)=lnx-(1/2)^x是個增函數 f(1)=-1/2 f(e)=1-(1/2)^e>0 f(1)f(e)
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