<p>计算<img src="https://learnfile.20230611.cn/learnAppQuestion/98/18/981863bf9f8c4a9b0d333fcb896703b2.jpg" style="width: 100%;height: auto;">其中<img src="https://learnfile.20230611.cn/learnAppQuestion/66/85/6685f6f50c9247a4b33e92c93d5a817d.jpg" style="