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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