设F=0,z=z(x,y),且F(u,v)连续可偏导,则=________.

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问题 设F=0,z=z(x,y),且F(u,v)连续可偏导,则=________.

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答案z

解析 =0两边对x求偏导,得
=0两边对y求偏导,得,于是
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