A.yxy-1 B.XyInx C.Xy-1 D.xy-1lnx

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问题 A.yxy-1B.XyInxC.Xy-1D.xy-1lnx

选项 A.yxy-1
B.XyInx
C.Xy-1
D.xy-1lnx

答案 A

解析 本题考查了一阶偏导数的知识点.
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