(1)设f(χ+y,χ-y)=χ2-y2+,求f(u,v),并求 (2)设z=f(χ,y)由f(χ+y,χ-y)=χ2-y2-χy确定,求dz.

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问题 (1)设f(χ+y,χ-y)=χ2-y2,求f(u,v),并求
    (2)设z=f(χ,y)由f(χ+y,χ-y)=χ2-y2-χy确定,求dz.

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答案(1)令[*] 从而f(u,v)=uv+[*] 于是[*] (2)令[*]代入得 f(u,v)=[*] 从而z=f(χ,y)=χy-[*], 由[*]得dz=(y-[*]χ)dχ+(χ+[*]]y)dy.

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