若 y = f(x) , 則 dy/dx = f ' (x) , 這兩個意義相同 f ' (x) 是牛頓用的微分符號 dy/dx 是萊布尼茲用的微分符號
而 ∂y/∂x 表示偏微分,也就是把其他變數視為常數,只對x微分
Q = L f(K/L)
∂Q/∂L = (∂L/∂L) * f(K/L) + L * ∂f(K/L)/∂L ( 利用性質 ( u v ) ' = u ' v + u v ' ) = f(K/L) + L * f ' (K/L) * ∂(K/L)/∂L ( 利用性質 df(u)/dx = f ' (u) * du/dx )
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