设z=x2+y2+xy,则=( )。A 2x+2y+x B 2x+2y+y C 2x+x+y D 2x+y

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问题 设z=x2+y2+xy,则=( )。

选项 A 2x+2y+x
B 2x+2y+y
C 2x+x+y
D 2x+y

答案D

解析对x求偏导数,将y看作常数,有
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