# OEF 多变量函数 --- 介绍 ---

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### 偏导数的复合 I

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(x,y)= ( , ) + ( , )

### 偏导数的复合 II

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(x,y)= ( , ) + ( )
+ ( ) + ( )
+ ( ) (x,y)= ( ) ( ) + ( , )
+ ( ) ( ) + ( ) ( )
+ ( ) (x,y)= ( ) + ( ) ( )
+ ( , ) + ( ) ( )
+ ( )

### 电阻变化 I

= + +

= + +

• Description: 一组关于多变量函数的练习. This is the main site of WIMS (WWW Interactive Multipurpose Server): interactive exercises, online calculators and plotters, mathematical recreation and games
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