微分數一條

2010-10-28 5:13 am

y=[3x-√(9x^2+8)]^5
dy/dx=?

更新1:

TO 知識就是力量: 感謝你的回答! 我也計到這個步驟但標準答案為: -15[3x-√(9x^2+8)]^5 ___________________ √(9x^2+8)

回答 (2)

2010-10-28 7:49 am

✔ 最佳答案

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圖片參考：http://img541.imageshack.us/img541/3424/differential.png

2010-10-28 00:09:58 補充：
http://img541.imageshack.us/img541/3424/differential.png

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2010-10-28 5:34 am

Sorry for some mistake in my ans
Correction in here:
http://img513.imageshack.us/img513/110/screenhunter02oct272137.png

2010-10-28 20:58:31 補充：
如freda 的答案所示
只需通分母把兩個terms 乘埋一齊
便得標準答案

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