<p>设函数<img src="https://learnfile.20230611.cn/learnAppQuestion/f4/f0/f4f0f007c1679f9c56f54cd36d54ceb1.jpg" style="width: 100%;height: auto;"> 求偏导数<img src="https://learnfile.20230611.cn/learnAppQuestion/b2/94/b29437eea7c450ab28d7d9694848e039.jpg" sty