已知函数f(x)=Inx+1/2*ax^2(1)若f(x)在(0,正无穷)上是单调函数,求参数a的取值范围。(2)若a=-1,f(x)≤M恒成立,求M的最小值(3)讨论方程f(x)=0的实根的个数
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![已知函数f(x)=Inx+1/2*ax^2(1)若f(x)在(0,正无穷)上是单调函数,求参数a的取值范围。(2)若a=-1,f(x)≤M恒成立,求M的最小值(3)讨论方程f(x)=0的实根的个数](/uploads/image/z/3743396-44-6.jpg?t=%E5%B7%B2%E7%9F%A5%E5%87%BD%E6%95%B0f%EF%BC%88x%EF%BC%89%3DInx%2B1%2F2%2Aax%5E2%281%29%E8%8B%A5f%28x%29%E5%9C%A8%EF%BC%880%EF%BC%8C%E6%AD%A3%E6%97%A0%E7%A9%B7%EF%BC%89%E4%B8%8A%E6%98%AF%E5%8D%95%E8%B0%83%E5%87%BD%E6%95%B0%EF%BC%8C%E6%B1%82%E5%8F%82%E6%95%B0a%E7%9A%84%E5%8F%96%E5%80%BC%E8%8C%83%E5%9B%B4%E3%80%82%EF%BC%882%EF%BC%89%E8%8B%A5a%3D-1%EF%BC%8Cf%EF%BC%88x%EF%BC%89%E2%89%A4M%E6%81%92%E6%88%90%E7%AB%8B%EF%BC%8C%E6%B1%82M%E7%9A%84%E6%9C%80%E5%B0%8F%E5%80%BC%EF%BC%883%EF%BC%89%E8%AE%A8%E8%AE%BA%E6%96%B9%E7%A8%8Bf%EF%BC%88x%EF%BC%89%3D0%E7%9A%84%E5%AE%9E%E6%A0%B9%E7%9A%84%E4%B8%AA%E6%95%B0)
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