<p> 将<img src="http://s3.qsxt.info/exams/201906/970dd724-2c92-44ba-adc3-d1ee616ed0c7.png"/>两边对<img src="http://s3.qsxt.info/exams/201906/acfed4b4-843b-4807-8a7c-12b9ef1209f0.png"/>求导，得<a></a><img src="http://s3.qsxt.info/exams/201906/7fc82954-cf75-49a7-a5f8-e06100cfbcc3.png"/>所以<img src="http://s3.qsxt.info/exams/201906/66517c79-3ebd-4090-a3ad-095528a0ee51.png"/></p>
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