设x=f(x,y)在点p0(x0,y0)可微分,且p0(x0,y0)为z的极大值点,则______.

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问题 设x=f(x,y)在点p0(x0,y0)可微分,且p0(x0,y0)为z的极大值点,则______.

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解析 本题考查的知识点为二元函数极值的必要条件.
   由于z=f(x,y)在点P0(x0,y0)可微分,P(x0,y0)为z的极值点,由极值的必要条件可知
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