<p>计算对面积的曲面积分<img max-width="300" src="https://learnfile.20230611.cn/learnAppQuestion/6a/3b/6a3bbb910656f8d3c83576f21fe0cddc.jpg" style="width: 100%;height: auto;"><img max-width="300" src="https://learnfile.20230611.cn/learnAppQuestion/b8/51/b8513f1