设f(x,y)=ln(x2+y2),g(x,y)=e(x+y),则f[x2,g(x,y)]=_______.

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问题 设f(x,y)=ln(x2+y2),g(x,y)=e(x+y),则f[x2,g(x,y)]=_______.

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答案ln(x4+e2x+2y)

解析 f[x2,g(x,y)]=f[x2,e(x-y)]=ln(x4+e2(x+y))=ln(x4+e2x+2y).
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