X log X = ?

2011-04-06 8:09 am
X log X = ?

請詳列計算方法。

回答 (2)

✔ 最佳答案

X log X = ?

 X log X
= X lnX / ln10
= (X / ln10) lnX

令 X = 1 + x , 即 x = X - 1

利用泰勒展開式:

圖片參考:http://i1233.photobucket.com/albums/ff384/oldmanjdd/Maths/lnx.jpg?t=1302381913


得到:

圖片參考:http://i1233.photobucket.com/albums/ff384/oldmanjdd/Maths/XlogX.jpg?t=1302385800

同理:

圖片參考:http://i1233.photobucket.com/albums/ff384/oldmanjdd/Maths/XlogX1.jpg?t=1302387646
參考: 瀝源野老
2011-04-07 3:31 am
xlogx=log(x^x)


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