<p> <img src="http://s3.qsxt.info/exams/201906/b5a1b16e-d46a-45da-b62d-b72a0ce10fea.png"/><br></br>令<img src="http://s3.qsxt.info/exams/201906/159205fb-baae-470e-b8bd-3928a858cee6.png"/>解得<img src="http://s3.qsxt.info/exams/201906/16d64d86-7e0e-44ad-97a4-2bdf4d9528d6.png"/></p><p> 当<img src="http://s3.qsxt.info/exams/201906/3eceb609-7776-4e74-b388-dd73b128b3a6.png"/>时，<img src="http://s3.qsxt.info/exams/201906/0e2a2c8c-fde4-4f2c-a185-1a857b473530.png"/></p><p> 当<img src="http://s3.qsxt.info/exams/201906/fe45b6f1-c278-479e-a604-9b789520a583.png"/>时，<img src="http://s3.qsxt.info/exams/201906/64da029a-743d-4a5f-a3b6-c67566836099.png"/></p><p> 当<img src="http://s3.qsxt.info/exams/201906/d4d9048d-2d93-4acc-b294-cd81810afd07.png"/>时，<img src="http://s3.qsxt.info/exams/201906/5700b99b-8b8e-474c-8f2a-cd81b0a19806.png"/></p><p> 因此，点<img src="http://s3.qsxt.info/exams/201906/5bab0a6c-8970-4570-9f42-be4139dcbb88.png"/>为所给曲线的拐点.</p>
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