z=f(xy)+yg(x2+y2),其中f,g二阶连续可导,则=_________.

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问题 z=f(xy)+yg(x2+y2),其中f,g二阶连续可导,则=_________.

选项

答案[*]f(xy)+y2f’’(xy)+2xg(x2+y2)+4xy2g’’(x2+y2)

解析 f(xy)+2xyg(x2+y2),
f(xy)+y2f’’(xy)+2xg(x2+y2)+4xy2g’’(x2+y2).
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