急:高中对数函数的复合函数设f(x)=log1/3[kx^2+(k+2)x+(k+2)],k∈R.若f(x)有最小值,求k的取值范围1/3(三分之一)为底,真数是[kx^2+(k+2)x+(k+2)]
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![急:高中对数函数的复合函数设f(x)=log1/3[kx^2+(k+2)x+(k+2)],k∈R.若f(x)有最小值,求k的取值范围1/3(三分之一)为底,真数是[kx^2+(k+2)x+(k+2)]](/uploads/image/z/14785791-15-1.jpg?t=%E6%80%A5%EF%BC%9A%E9%AB%98%E4%B8%AD%E5%AF%B9%E6%95%B0%E5%87%BD%E6%95%B0%E7%9A%84%E5%A4%8D%E5%90%88%E5%87%BD%E6%95%B0%E8%AE%BEf%28x%29%3Dlog1%2F3%5Bkx%5E2%2B%28k%2B2%29x%2B%28k%2B2%29%5D%2Ck%E2%88%88R.%E8%8B%A5f%28x%29%E6%9C%89%E6%9C%80%E5%B0%8F%E5%80%BC%2C%E6%B1%82k%E7%9A%84%E5%8F%96%E5%80%BC%E8%8C%83%E5%9B%B41%2F3%EF%BC%88%E4%B8%89%E5%88%86%E4%B9%8B%E4%B8%80%EF%BC%89%E4%B8%BA%E5%BA%95%EF%BC%8C%E7%9C%9F%E6%95%B0%E6%98%AF%5Bkx%5E2%2B%28k%2B2%29x%2B%28k%2B2%29%5D)
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