抱歉:漏看了條件(2),答案應該修改為

來源: ^V^ 於 2009-04-14 12:43:49 [博客] [舊帖] [給我悄悄話] 本文已被閱讀：次

f(x)=(x+1)/2x 0 f(x)=(1+1/x)x/2 x>=1

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