已知函数f(x)=(1/a)x^2-2x-b(a>0)①若f(x)在[2,+∞)上是单调函数,求a的取值范围已知函数f(x)=(1/a)x^2-2x-b(a>0)①若f(x)在[2,+∞)上是单调函数,求a的取值范围②若f(x)在[-2,3]上的最大值为6,最小值为-3,求a,b
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![已知函数f(x)=(1/a)x^2-2x-b(a>0)①若f(x)在[2,+∞)上是单调函数,求a的取值范围已知函数f(x)=(1/a)x^2-2x-b(a>0)①若f(x)在[2,+∞)上是单调函数,求a的取值范围②若f(x)在[-2,3]上的最大值为6,最小值为-3,求a,b](/uploads/image/z/5275954-10-4.jpg?t=%E5%B7%B2%E7%9F%A5%E5%87%BD%E6%95%B0f%28x%29%3D%281%2Fa%29x%5E2-2x-b%28a%3E0%29%E2%91%A0%E8%8B%A5f%28x%29%E5%9C%A8%5B2%2C%2B%E2%88%9E%29%E4%B8%8A%E6%98%AF%E5%8D%95%E8%B0%83%E5%87%BD%E6%95%B0%2C%E6%B1%82a%E7%9A%84%E5%8F%96%E5%80%BC%E8%8C%83%E5%9B%B4%E5%B7%B2%E7%9F%A5%E5%87%BD%E6%95%B0f%28x%29%3D%281%2Fa%29x%5E2-2x-b%28a%3E0%29%E2%91%A0%E8%8B%A5f%28x%29%E5%9C%A8%5B2%2C%2B%E2%88%9E%EF%BC%89%E4%B8%8A%E6%98%AF%E5%8D%95%E8%B0%83%E5%87%BD%E6%95%B0%2C%E6%B1%82a%E7%9A%84%E5%8F%96%E5%80%BC%E8%8C%83%E5%9B%B4%E2%91%A1%E8%8B%A5f%28x%29%E5%9C%A8%5B-2%2C3%5D%E4%B8%8A%E7%9A%84%E6%9C%80%E5%A4%A7%E5%80%BC%E4%B8%BA6%2C%E6%9C%80%E5%B0%8F%E5%80%BC%E4%B8%BA-3%2C%E6%B1%82a%2Cb)
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