f(xy,x-y)=x^2+y^2+xy;f(x,y)/∂x;f(x,y)/∂y
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f(xy,x-y)=x^2+y^2+xy;f(x,y)/∂x;f(x,y)/∂yf(xy,x-y)=x^2+y^2+xy;f(x,y)/∂x;f(x,y)/W
f(xy,x-y)=x^2+y^2+xy;f(x,y)/∂x;f(x,y)/∂y
f(xy,x-y)=x^2+y^2+xy;f(x,y)/∂x;f(x,y)/∂y
f(xy,x-y)=x^2+y^2+xy;f(x,y)/∂x;f(x,y)/∂y
由f（xy,x-y）=x²+y²+xy,
=x²-2xy+y²+3xy
=（x-y）²+3xy,
设m=xy, n=x-y,
即f（m,n）=3m+n²
得f（x,y）=3x+y²
f（x,y）对x的偏导数=3,
f（想,y）对y的偏导数=2y.
偏导数符号我不会打.
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