设a属于R ,函数f(x)=ax^3—3x^2,x=2是函数y=f(x)的极值点.求(1)a的值 (2)求函数f(x)=ax^3—3x^急用(2)求函数f(x)=ax^3—3x^2在区间【-1,5】上的最值
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![设a属于R ,函数f(x)=ax^3—3x^2,x=2是函数y=f(x)的极值点.求(1)a的值 (2)求函数f(x)=ax^3—3x^急用(2)求函数f(x)=ax^3—3x^2在区间【-1,5】上的最值](/uploads/image/z/2682604-28-4.jpg?t=%E8%AE%BEa%E5%B1%9E%E4%BA%8ER+%2C%E5%87%BD%E6%95%B0f%EF%BC%88x%EF%BC%89%3Dax%5E3%E2%80%943x%5E2%2Cx%3D2%E6%98%AF%E5%87%BD%E6%95%B0y%3Df%28x%29%E7%9A%84%E6%9E%81%E5%80%BC%E7%82%B9.%E6%B1%82%EF%BC%881%EF%BC%89a%E7%9A%84%E5%80%BC+%EF%BC%882%EF%BC%89%E6%B1%82%E5%87%BD%E6%95%B0f%EF%BC%88x%EF%BC%89%3Dax%5E3%E2%80%943x%5E%E6%80%A5%E7%94%A8%EF%BC%882%EF%BC%89%E6%B1%82%E5%87%BD%E6%95%B0f%EF%BC%88x%EF%BC%89%3Dax%5E3%E2%80%943x%5E2%E5%9C%A8%E5%8C%BA%E9%97%B4%E3%80%90-1%2C5%E3%80%91%E4%B8%8A%E7%9A%84%E6%9C%80%E5%80%BC)
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