恒成立问题,尤其是函数有定义域时,对我来说很难理解,希望大家讲解的清楚些,(1)已知x属于(2,6)时,f(x)=lg(-x^2+kx-12)有意义,求K的范围?此题怎做?x属于(2,6),-x^2+kx-12>0恒成立的充要条件是啥?请做一
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![恒成立问题,尤其是函数有定义域时,对我来说很难理解,希望大家讲解的清楚些,(1)已知x属于(2,6)时,f(x)=lg(-x^2+kx-12)有意义,求K的范围?此题怎做?x属于(2,6),-x^2+kx-12>0恒成立的充要条件是啥?请做一](/uploads/image/z/14049529-25-9.jpg?t=%E6%81%92%E6%88%90%E7%AB%8B%E9%97%AE%E9%A2%98%2C%E5%B0%A4%E5%85%B6%E6%98%AF%E5%87%BD%E6%95%B0%E6%9C%89%E5%AE%9A%E4%B9%89%E5%9F%9F%E6%97%B6%2C%E5%AF%B9%E6%88%91%E6%9D%A5%E8%AF%B4%E5%BE%88%E9%9A%BE%E7%90%86%E8%A7%A3%2C%E5%B8%8C%E6%9C%9B%E5%A4%A7%E5%AE%B6%E8%AE%B2%E8%A7%A3%E7%9A%84%E6%B8%85%E6%A5%9A%E4%BA%9B%2C%281%29%E5%B7%B2%E7%9F%A5x%E5%B1%9E%E4%BA%8E%282%2C6%29%E6%97%B6%2Cf%28x%29%3Dlg%28-x%5E2%2Bkx-12%29%E6%9C%89%E6%84%8F%E4%B9%89%2C%E6%B1%82K%E7%9A%84%E8%8C%83%E5%9B%B4%3F%E6%AD%A4%E9%A2%98%E6%80%8E%E5%81%9A%3Fx%E5%B1%9E%E4%BA%8E%282%2C6%29%2C-x%5E2%2Bkx-12%3E0%E6%81%92%E6%88%90%E7%AB%8B%E7%9A%84%E5%85%85%E8%A6%81%E6%9D%A1%E4%BB%B6%E6%98%AF%E5%95%A5%3F%E8%AF%B7%E5%81%9A%E4%B8%80)
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