<p>设函数<img src="https://learnfile.20230611.cn/learnAppQuestion/a3/0c/a30c2529b1f402a76dadfd059a2a839e.jpg" style="width: 100%;height: auto;">，求偏导数<img src="https://learnfile.20230611.cn/learnAppQuestion/0b/65/0b6525391ad327dca01779470030e858.jpg" sty