设函数z = z(x,y)由方程z=δ(x-y,y-z)所确定,其中δ(u,v)有一阶连续偏导数,求z对x的二阶偏导数?

2024-11-18 19:30:34
推荐回答(1个)
回答1:

令u = x - y,v = y - z
∂z/∂x = ∂f/∂u · ∂u/∂x + ∂f/∂v · ∂v/∂x
= F₁ · 1 + F₂ · 0
= F₁
∂²z/∂x² = ∂F₁/∂x
= F₁₁