设z^3-xyz=a^3,求z关于x和y的偏导数
人气:271 ℃ 时间:2020-04-16 01:59:02
解答
设F(x)=z³-xyz-a³
əz/əx=-F′x/F′z=-(-yz)/(3z²-xy)=yz/(3z²-xy)
əz/əy=-F′y/F′z=-(-xz)/(3z²-xy)=xz/(3z²-xy)
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