<p>设函数z=<img src="https://learnfile.20230611.cn/learnAppQuestion/8f/8d/8f8d00bad9272541eabf289d2be524da.jpg" style="width: 100%;height: auto;">,则偏导数<img src="https://learnfile.20230611.cn/learnAppQuestion/01/e3/01e397f81b248de433bc8ee276a745ac.jpg" s