f(x)如果是增函数,那么f(x)的倒数f '(x)>0还是f '(x)>=0,我弄不懂什么时候取等号,什么时候不取,有些时候好像取不取结果都一样?
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![f(x)如果是增函数,那么f(x)的倒数f '(x)>0还是f '(x)>=0,我弄不懂什么时候取等号,什么时候不取,有些时候好像取不取结果都一样?](/uploads/image/z/3754476-36-6.jpg?t=f%28x%29%E5%A6%82%E6%9E%9C%E6%98%AF%E5%A2%9E%E5%87%BD%E6%95%B0%2C%E9%82%A3%E4%B9%88f%28x%29%E7%9A%84%E5%80%92%E6%95%B0f+%27%28x%29%3E0%E8%BF%98%E6%98%AFf+%27%28x%29%3E%3D0%2C%E6%88%91%E5%BC%84%E4%B8%8D%E6%87%82%E4%BB%80%E4%B9%88%E6%97%B6%E5%80%99%E5%8F%96%E7%AD%89%E5%8F%B7%2C%E4%BB%80%E4%B9%88%E6%97%B6%E5%80%99%E4%B8%8D%E5%8F%96%2C%E6%9C%89%E4%BA%9B%E6%97%B6%E5%80%99%E5%A5%BD%E5%83%8F%E5%8F%96%E4%B8%8D%E5%8F%96%E7%BB%93%E6%9E%9C%E9%83%BD%E4%B8%80%E6%A0%B7%3F)
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