<p>设函数<img src="https://learnfile.20230611.cn/learnAppQuestion/38/b7/38b74cefc1adeadecd371c83df38fe9c.jpg" style="width: 100%;height: auto;">在点<img src="https://learnfile.20230611.cn/learnAppQuestion/4e/93/4e932e4b7b0da136f0b7743feeedfbaf.jpg" style=