高二 数学 函数 请详细解答,谢谢! (25 9:22:45)已知函数f(x)=3x,f(2+a)=18,g(x)=r×3ax-4x的定义域为【0,1】1)求a的值2)若函数g(x)在【0,1】上是单调递减函数,求实属r的取值范围3)若函数g(x)的最大值
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![高二 数学 函数 请详细解答,谢谢! (25 9:22:45)已知函数f(x)=3x,f(2+a)=18,g(x)=r×3ax-4x的定义域为【0,1】1)求a的值2)若函数g(x)在【0,1】上是单调递减函数,求实属r的取值范围3)若函数g(x)的最大值](/uploads/image/z/803759-23-9.jpg?t=%E9%AB%98%E4%BA%8C+%E6%95%B0%E5%AD%A6+%E5%87%BD%E6%95%B0+%E8%AF%B7%E8%AF%A6%E7%BB%86%E8%A7%A3%E7%AD%94%2C%E8%B0%A2%E8%B0%A2%21++++%2825+9%3A22%3A45%29%E5%B7%B2%E7%9F%A5%E5%87%BD%E6%95%B0f%28x%29%3D3x%2Cf%282%2Ba%29%3D18%2Cg%28x%29%3Dr%C3%973ax-4x%E7%9A%84%E5%AE%9A%E4%B9%89%E5%9F%9F%E4%B8%BA%E3%80%900%2C1%E3%80%911%EF%BC%89%E6%B1%82a%E7%9A%84%E5%80%BC2%EF%BC%89%E8%8B%A5%E5%87%BD%E6%95%B0g%28x%29%E5%9C%A8%E3%80%900%2C1%E3%80%91%E4%B8%8A%E6%98%AF%E5%8D%95%E8%B0%83%E9%80%92%E5%87%8F%E5%87%BD%E6%95%B0%2C%E6%B1%82%E5%AE%9E%E5%B1%9Er%E7%9A%84%E5%8F%96%E5%80%BC%E8%8C%83%E5%9B%B43%EF%BC%89%E8%8B%A5%E5%87%BD%E6%95%B0g%28x%29%E7%9A%84%E6%9C%80%E5%A4%A7%E5%80%BC)
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