题目

以下是求=(y)^2(x)^3+(y)^3(x)^2-dfrac (1)(ln (xy)) 的偏导数=(y)^2(x)^3+(y)^3(x)^2-dfrac (1)(ln (xy))的步骤请选出正确步骤（）a =(y)^2(x)^3+(y)^3(x)^2-dfrac (1)(ln (xy)) b =(y)^2(x)^3+(y)^3(x)^2-dfrac (1)(ln (xy))c =(y)^2(x)^3+(y)^3(x)^2-dfrac (1)(ln (xy))d =(y)^2(x)^3+(y)^3(x)^2-dfrac (1)(ln (xy))A =(y)^2(x)^3+(y)^3(x)^2-dfrac (1)(ln (xy))B =(y)^2(x)^3+(y)^3(x)^2-dfrac (1)(ln (xy))C =(y)^2(x)^3+(y)^3(x)^2-dfrac (1)(ln (xy))D=(y)^2(x)^3+(y)^3(x)^2-dfrac (1)(ln (xy))

以下是求 的偏导数的步骤请选出正确步骤（）

a  

b

c

d

A

B

C 

D

题目解答

答案

本题答案选D

已知

对函数求一阶偏导可得

再对函数求二阶偏导可得

故可得步骤顺序为