<p>设函数<img src="https://learnfile.20230611.cn/learnAppQuestion/85/53/8553a2b91f7cc37b2a573855bcc61b18.jpg" style="width: 100%;height: auto;">在点<img src="https://learnfile.20230611.cn/learnAppQuestion/03/71/03713f7b751761ced0bd63d5a6189e4e.jpg" style=