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第一種方法如樓上所說,f(1)相當於f(lgx)|x=10時(1+x)/(2+x)的值,即12/11. 也可以直接代換回來得到f的顯式表示:y=>lgx:x=10^y:f(lg x)=f(y)=(2+10^y)/(1+10^y),代入得f(1)=12/11.
f(x)=lgx+1/x-1
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