已知f(x)=lnx-ax^2-bx (1)当a=1,b=-1时,证明函数f(x)只有一个零点(2)若f(x)的图像与x轴交于A(x1,0),B(x2,0)(x1<x2)两点,AB中点为C(x0,0),求证:f ’(x0)<0
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![已知f(x)=lnx-ax^2-bx (1)当a=1,b=-1时,证明函数f(x)只有一个零点(2)若f(x)的图像与x轴交于A(x1,0),B(x2,0)(x1<x2)两点,AB中点为C(x0,0),求证:f ’(x0)<0](/uploads/image/z/4484215-55-5.jpg?t=%E5%B7%B2%E7%9F%A5f%28x%29%3Dlnx-ax%5E2-bx+%281%29%E5%BD%93a%3D1%2Cb%3D-1%E6%97%B6%2C%E8%AF%81%E6%98%8E%E5%87%BD%E6%95%B0f%28x%29%E5%8F%AA%E6%9C%89%E4%B8%80%E4%B8%AA%E9%9B%B6%E7%82%B9%EF%BC%882%EF%BC%89%E8%8B%A5f%EF%BC%88x%EF%BC%89%E7%9A%84%E5%9B%BE%E5%83%8F%E4%B8%8Ex%E8%BD%B4%E4%BA%A4%E4%BA%8EA%EF%BC%88x1%2C0%EF%BC%89%2CB%EF%BC%88x2%2C0%EF%BC%89%EF%BC%88x1%EF%BC%9Cx2%EF%BC%89%E4%B8%A4%E7%82%B9%2CAB%E4%B8%AD%E7%82%B9%E4%B8%BAC%EF%BC%88x0%2C0%EF%BC%89%2C%E6%B1%82%E8%AF%81%EF%BC%9Af+%E2%80%99%EF%BC%88x0%EF%BC%89%EF%BC%9C0)
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