已知f(x-y,xy)=x^2+y^2,则f(x,y)=

2025-02-27 14:19:46
推荐回答(1个)
回答1:

x-y=u, xy=v
x^2+y^2=(x-y)^2+2xy
f(u,v)=u^2+2v
f(x,y)=x^2+2y