<p>设函数<img src="https://file.gaojiufeng.cn/learnAppQuestion/b8/84/b884291051973bd08375bf5c52aa5e15.jpg" style="width: 100%;height: auto;">在<img src="https://file.gaojiufeng.cn/learnAppQuestion/ab/8e/ab8e764d322a3f8ed5ee6ef6a7eb6450.jpg" style="width: 100%;height: auto;">处取得极值，点<img src="https://file.gaojiufeng.cn/learnAppQuestion/91/e5/91e5ccb623799b99c6ad48bd38c7494e.jpg" style="width: 100%;height: auto;">为曲线<img src="https://file.gaojiufeng.cn/learnAppQuestion/de/c1/dec1e017c10bb593171487ac7ac1ab7f.jpg" style="width: 100%;height: auto;">的拐点，求<img src="https://file.gaojiufeng.cn/learnAppQuestion/cc/a8/cca8b94e4d9957438457347c76609ec8.jpg" style="width: 100%;height: auto;"></p>