L = L(x) , 如 x > 0, L'(x) = 1/x
如果 f(x) = L(x^-8), f '(x)=?
A. -8/x*L(x)^9
B. -8/x
C. 8L(x)^7/x
D. 8/x
E. 1/x
F. -1/x
如果唔准用積分, 點搵答案?
只是微分MC一條... (急~)
2011-02-04 3:35 pm
回答 (1)
2011-02-04 7:15 pm
✔ 最佳答案
f(x) = L(1/x^8)Let y = 1/x^8
f'(x)
= L'(y)y'
= (x^8)(-8/x^9)
= -8/x
ANSWER: B
收錄日期: 2021-04-26 14:05:58
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20110204000051KK00168