1 . 定义:设二元函数
在点
的附近有定义,当
固定在
而
在
处有改变量
时,相应的二元函数
有改变量
,如果
存在,那么称此极限为二元函数
在点
处对
的偏导数,记作
.若
在区域D内每一个点
对
的偏导数都存在,那么这个偏导数就是一个关于x,y的二元函数,它就被称为二元函数
对自变量
的偏导函数,记作
.已知
,若
,则
的取值范围为( )
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2023-12-22更新
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