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【简答题】
设f(x)为Rn上的一个Cr函数(r≥1)，M={x∈Rn｜f(x)=0}≠∮，且对设M为R3中的一个2维Ck(k≥1)正则曲面，点P∈ 设M为R3中的一个2维Ck(k≥1)正则曲面，点P∈M．证明：在M中存在P的一个开邻域U，使得U可用下列3种形式的Ck函数：2=f(x，y)， y=g(x，z)， x=h(y，z)中的一个确定为Ck曲面片．
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