作者LuisSantos (^______^)
看板trans_math
標題Re: [微分] 93政大科管
時間Mon Dec 3 00:30:36 2007
※ 引述《bitchdog (PEaCE)》之銘言：
: if y=2-3x^2 , u=x^3+1 , 當 u=9 , 試求 dy
: ----
: du
dy (dy/dx)
---- = ---------
du (du/dx)
-6x -2
= ---------- = ----
(3)(x^2) x
u = 9 => x^3 + 1 = 9 => x^3 = 8 => x = 2
dy | -2 | -2
----| = ----| = --- = -1
du |u = 9 x |x = 2 2
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