<p> <img src="http://s3.qsxt.info/exams/201906/4c4952ee-9e61-48aa-afff-b0dc3116ec78.png"/></p><p> <img src="http://s3.qsxt.info/exams/201906/16cfe39a-1920-4dad-b6a9-968a197acf63.png"/></p><p> 所以<img src="http://s3.qsxt.info/exams/201906/a168a93b-333a-434f-a49c-a127d61abb53.png"/></p><p> 则<img src="http://s3.qsxt.info/exams/201906/602e7d14-03c2-4261-abff-89aec03d96b2.png"/>又<img src="http://s3.qsxt.info/exams/201906/fc65635f-f90a-4277-9089-806379a884b3.png"/>，所以<img src="http://s3.qsxt.info/exams/201906/1dac1b03-be5a-4203-b424-27bf30fb134d.png"/>在点<img src="http://s3.qsxt.info/exams/201906/3bebba2a-d8f9-47c0-a92f-5e7cd52ea7bc.png"/>处取得极小值，极小值为<img src="http://s3.qsxt.info/exams/201906/870d5979-74e9-4d49-b63e-46fd92a4dba7.png"/></p>
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