高数求偏导

2025-03-20 03:02:32
推荐回答(2个)
回答1:

f(x+y,x-y) = x^2-y^2=(x+y)(x-y)
f(x,y) = xy
∂f/∂x =y
∂f/∂y =x

∂f/∂x+ ∂f/∂y =x+y

回答2: