高阶导数疑问书上求二阶导数有这个公式d/dx(dy/dx),dy/dx是求一阶导数,d/dx是什么意思?是否就是d(dy/dx)再求一次导,然后除以dx?如果是这样,那么y``这个二阶导数和d/dx(dy/dx)那不就不相等了?除多了
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![高阶导数疑问书上求二阶导数有这个公式d/dx(dy/dx),dy/dx是求一阶导数,d/dx是什么意思?是否就是d(dy/dx)再求一次导,然后除以dx?如果是这样,那么y``这个二阶导数和d/dx(dy/dx)那不就不相等了?除多了](/uploads/image/z/10365285-21-5.jpg?t=%E9%AB%98%E9%98%B6%E5%AF%BC%E6%95%B0%E7%96%91%E9%97%AE%E4%B9%A6%E4%B8%8A%E6%B1%82%E4%BA%8C%E9%98%B6%E5%AF%BC%E6%95%B0%E6%9C%89%E8%BF%99%E4%B8%AA%E5%85%AC%E5%BC%8Fd%2Fdx%28dy%2Fdx%29%2Cdy%2Fdx%E6%98%AF%E6%B1%82%E4%B8%80%E9%98%B6%E5%AF%BC%E6%95%B0%2Cd%2Fdx%E6%98%AF%E4%BB%80%E4%B9%88%E6%84%8F%E6%80%9D%3F%E6%98%AF%E5%90%A6%E5%B0%B1%E6%98%AFd%28dy%2Fdx%29%E5%86%8D%E6%B1%82%E4%B8%80%E6%AC%A1%E5%AF%BC%2C%E7%84%B6%E5%90%8E%E9%99%A4%E4%BB%A5dx%3F%E5%A6%82%E6%9E%9C%E6%98%AF%E8%BF%99%E6%A0%B7%2C%E9%82%A3%E4%B9%88y%60%60%E8%BF%99%E4%B8%AA%E4%BA%8C%E9%98%B6%E5%AF%BC%E6%95%B0%E5%92%8Cd%2Fdx%28dy%2Fdx%29%E9%82%A3%E4%B8%8D%E5%B0%B1%E4%B8%8D%E7%9B%B8%E7%AD%89%E4%BA%86%3F%E9%99%A4%E5%A4%9A%E4%BA%86)
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