Derivative問題...急!!!

👨🏻‍🏫 學術台數學

JESS

2007-04-21 8:37 am

Given f(x) 2 / √x

find the derivative of f(x) by first principle

個step點計,answer 係咩?

回答 (2)

myisland8132

2007-04-21 9:02 am

✔ 最佳答案

Given f(x) =2 / √x

find the derivative of f(x) by first principle

圖片參考：http://in.geocities.com/myisland8132/7007042100156.gif

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Thomas

2007-05-19 6:54 am

第5個等號那一行錯了
[sqrt(x) - sqrt(x + dx)][sqrt(x) + sqrt(x + dx)]
=x - (x + dx)
=x - x - dx
= - dx
所以答案欠 "-" 號

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