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

设z=x2+y2+xy,则=( )。A 2x+2y+x B 2x+2y+y

练习题库2022-08-02  34

问题 设z=x2+y2+xy,则=( )。A 2x+2y+xB 2x+2y+yC 2x+x+yD 2x+y

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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本试题收录于: 基础知识水利水电题库水利水电土木工程师分类

基础知识水利水电

水利水电土木工程师

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