・この動画「

数学分析 第三节方向导数与梯度 高阶导数

」@bilibili.comと
　　↓↓↓一緒に視聴されています(Often Viewed With)：↓↓↓
・数学分析 第17章多元函数微分学第一节可微性（1）
・数学分析 第17章第二节复合函数微分法
・数学分析 第5节 三重积分（1）
・数学分析 第二节二元函数的极限
・数学分析 第17章第一节可微性（2）

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