• 2022-06-30
    函数[img=82x25]18036b5f6c60ac6.png[/img]在点[img=41x25]18036b5f74cfeee.png[/img]处偏导数存在且连续是函数[img=82x25]18036b5f6c60ac6.png[/img]在点[img=41x25]18036b5f74cfeee.png[/img]处可微的充分条件.