已知fx=lg(x^2-2ax-a)在区间(-00,-3)上是减函数,1.求实数a的取值范围;2.定义域为R求a的取值范围;3.值域为R求a的取值范围
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![已知fx=lg(x^2-2ax-a)在区间(-00,-3)上是减函数,1.求实数a的取值范围;2.定义域为R求a的取值范围;3.值域为R求a的取值范围](/uploads/image/z/5279829-69-9.jpg?t=%E5%B7%B2%E7%9F%A5fx%3Dlg%28x%5E2-2ax-a%29%E5%9C%A8%E5%8C%BA%E9%97%B4%28-00%2C-3%29%E4%B8%8A%E6%98%AF%E5%87%8F%E5%87%BD%E6%95%B0%2C1.%E6%B1%82%E5%AE%9E%E6%95%B0a%E7%9A%84%E5%8F%96%E5%80%BC%E8%8C%83%E5%9B%B4%EF%BC%9B2.%E5%AE%9A%E4%B9%89%E5%9F%9F%E4%B8%BAR%E6%B1%82a%E7%9A%84%E5%8F%96%E5%80%BC%E8%8C%83%E5%9B%B4%EF%BC%9B3.%E5%80%BC%E5%9F%9F%E4%B8%BAR%E6%B1%82a%E7%9A%84%E5%8F%96%E5%80%BC%E8%8C%83%E5%9B%B4)
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